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* [syzbot] KASAN: null-ptr-deref Read in phy_disconnect
@ 2021-08-31 10:36 syzbot
  2021-08-31 13:48 ` Jakub Kicinski
  0 siblings, 1 reply; 5+ messages in thread
From: syzbot @ 2021-08-31 10:36 UTC (permalink / raw)
  To: andrew, davem, hkallweit1, kuba, linux-kernel, linux-usb, linux,
	netdev, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    9c1587d99f93 usb: isp1760: otg control register access
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=16907291300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=24756feea212a6b0
dashboard link: https://syzkaller.appspot.com/bug?extid=6a916267d9bc5fa2d9a6
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166de449300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c5ddce300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+6a916267d9bc5fa2d9a6@syzkaller.appspotmail.com

asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
usb 1-1: USB disconnect, device number 2
asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
general protection fault, probably for non-canonical address 0xdffffc00000000c3: 0000 [#1] SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000618-0x000000000000061f]
CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ax88772_unbind+0x51/0x90 drivers/net/usb/asix_devices.c:816
 usbnet_disconnect+0x103/0x270 drivers/net/usb/usbnet.c:1618
 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
 __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201
 device_release_driver_internal drivers/base/dd.c:1232 [inline]
 device_release_driver+0x26/0x40 drivers/base/dd.c:1255
 bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529
 device_del+0x502/0xd40 drivers/base/core.c:3543
 usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419
 usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225
 hub_port_connect drivers/usb/core/hub.c:5199 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5488 [inline]
 port_event drivers/usb/core/hub.c:5634 [inline]
 hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716
 process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276
 process_scheduled_works kernel/workqueue.c:2338 [inline]
 worker_thread+0x85c/0x11f0 kernel/workqueue.c:2424
 kthread+0x3c0/0x4a0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
---[ end trace d08c08ba92f8f06f ]---
RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
   7:	00
   8:	55                   	push   %rbp
   9:	48 89 fd             	mov    %rdi,%rbp
   c:	53                   	push   %rbx
   d:	e8 46 33 68 fe       	callq  0xfe683358
  12:	48 8d bd 18 06 00 00 	lea    0x618(%rbp),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e c5 00 00 00    	jle    0xff
  3a:	8b 9d 18 06 00 00    	mov    0x618(%rbp),%ebx


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [syzbot] KASAN: null-ptr-deref Read in phy_disconnect
  2021-08-31 10:36 [syzbot] KASAN: null-ptr-deref Read in phy_disconnect syzbot
@ 2021-08-31 13:48 ` Jakub Kicinski
  2021-08-31 14:20   ` Andrew Lunn
  0 siblings, 1 reply; 5+ messages in thread
From: Jakub Kicinski @ 2021-08-31 13:48 UTC (permalink / raw)
  To: syzbot
  Cc: andrew, davem, hkallweit1, linux-kernel, linux-usb, linux,
	netdev, syzkaller-bugs, Oleksij Rempel

On Tue, 31 Aug 2021 03:36:23 -0700 syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    9c1587d99f93 usb: isp1760: otg control register access
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=16907291300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=24756feea212a6b0
> dashboard link: https://syzkaller.appspot.com/bug?extid=6a916267d9bc5fa2d9a6
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166de449300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c5ddce300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6a916267d9bc5fa2d9a6@syzkaller.appspotmail.com
> 
> asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
> usb 1-1: USB disconnect, device number 2
> asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
> general protection fault, probably for non-canonical address 0xdffffc00000000c3: 0000 [#1] SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000618-0x000000000000061f]
> CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.14.0-rc7-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
> RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
> Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
> RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
> RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
> RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
> RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
> R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
> R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
> FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  ax88772_unbind+0x51/0x90 drivers/net/usb/asix_devices.c:816
>  usbnet_disconnect+0x103/0x270 drivers/net/usb/usbnet.c:1618
>  usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458
>  __device_release_driver+0x3bd/0x6f0 drivers/base/dd.c:1201
>  device_release_driver_internal drivers/base/dd.c:1232 [inline]
>  device_release_driver+0x26/0x40 drivers/base/dd.c:1255
>  bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:529
>  device_del+0x502/0xd40 drivers/base/core.c:3543
>  usb_disable_device+0x35b/0x7b0 drivers/usb/core/message.c:1419
>  usb_disconnect.cold+0x27a/0x78e drivers/usb/core/hub.c:2225
>  hub_port_connect drivers/usb/core/hub.c:5199 [inline]
>  hub_port_connect_change drivers/usb/core/hub.c:5488 [inline]
>  port_event drivers/usb/core/hub.c:5634 [inline]
>  hub_event+0x1c9c/0x4330 drivers/usb/core/hub.c:5716
>  process_one_work+0x98d/0x15b0 kernel/workqueue.c:2276
>  process_scheduled_works kernel/workqueue.c:2338 [inline]
>  worker_thread+0x85c/0x11f0 kernel/workqueue.c:2424
>  kthread+0x3c0/0x4a0 kernel/kthread.c:319
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
> Modules linked in:
> ---[ end trace d08c08ba92f8f06f ]---
> RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
> RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
> Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
> RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
> RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
> RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
> RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
> R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
> R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
> FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess):
>    0:	0f 1f 84 00 00 00 00 	nopl   0x0(%rax,%rax,1)
>    7:	00
>    8:	55                   	push   %rbp
>    9:	48 89 fd             	mov    %rdi,%rbp
>    c:	53                   	push   %rbx
>    d:	e8 46 33 68 fe       	callq  0xfe683358
>   12:	48 8d bd 18 06 00 00 	lea    0x618(%rbp),%rdi
>   19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
>   20:	fc ff df
>   23:	48 89 fa             	mov    %rdi,%rdx
>   26:	48 c1 ea 03          	shr    $0x3,%rdx
> * 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
>   2e:	84 c0                	test   %al,%al
>   30:	74 08                	je     0x3a
>   32:	3c 03                	cmp    $0x3,%al
>   34:	0f 8e c5 00 00 00    	jle    0xff
>   3a:	8b 9d 18 06 00 00    	mov    0x618(%rbp),%ebx
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches

Oleksij may know.

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [syzbot] KASAN: null-ptr-deref Read in phy_disconnect
  2021-08-31 13:48 ` Jakub Kicinski
@ 2021-08-31 14:20   ` Andrew Lunn
  2021-08-31 15:30     ` Oleksij Rempel
  0 siblings, 1 reply; 5+ messages in thread
From: Andrew Lunn @ 2021-08-31 14:20 UTC (permalink / raw)
  To: Jakub Kicinski
  Cc: syzbot, davem, hkallweit1, linux-kernel, linux-usb, linux,
	netdev, syzkaller-bugs, Oleksij Rempel

On Tue, Aug 31, 2021 at 06:48:45AM -0700, Jakub Kicinski wrote:
> On Tue, 31 Aug 2021 03:36:23 -0700 syzbot wrote:
> > Hello,
> > 
> > syzbot found the following issue on:
> > 
> > HEAD commit:    9c1587d99f93 usb: isp1760: otg control register access
> > git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16907291300000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=24756feea212a6b0
> > dashboard link: https://syzkaller.appspot.com/bug?extid=6a916267d9bc5fa2d9a6
> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166de449300000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c5ddce300000
> > 
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+6a916267d9bc5fa2d9a6@syzkaller.appspotmail.com
> > 
> > asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
> > usb 1-1: USB disconnect, device number 2
> > asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
> > general protection fault, probably for non-canonical address 0xdffffc00000000c3: 0000 [#1] SMP KASAN
> > KASAN: null-ptr-deref in range [0x0000000000000618-0x000000000000061f]
> > CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.14.0-rc7-syzkaller #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> > Workqueue: usb_hub_wq hub_event
> > RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
> > RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
> > Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
> > RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
> > RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
> > RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
> > RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
> > R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
> > R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
> > FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
> > CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
> > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > Call Trace:
> >  ax88772_unbind+0x51/0x90 drivers/net/usb/asix_devices.c:816

Looking at the console messages:

[   36.456221][   T32] usb 1-1: new high-speed USB device number 2 using dummy_hcd
[   36.976035][   T32] usb 1-1: New USB device found, idVendor=0df6, idProduct=0056, bcdDevice=42.6c
[   36.985338][   T32] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   36.993579][   T32] usb 1-1: Product: syz
[   36.997817][   T32] usb 1-1: Manufacturer: syz
[   37.002423][   T32] usb 1-1: SerialNumber: syz
[   37.013578][   T32] usb 1-1: config 0 descriptor??
[   37.276018][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): invalid hw address, using random
executing program
[   37.715517][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
[   37.725693][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
[   37.925418][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
[   37.936461][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
[   38.119561][   T32] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
[   38.138828][   T32] usb 1-1: USB disconnect, device number 2
[   38.150689][   T32] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet

So this is a AX88178, and you would expect it to use
ax88178_bind(). That function never calls ax88772_init_phy() which is
what connects the PHY to the MAC, and sets priv->phydev.

static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
{
        struct asix_common_private *priv = dev->driver_priv;

        phy_disconnect(priv->phydev);

So this passes a NULL pointer.

static const struct driver_info ax88178_info = {
        .description = "ASIX AX88178 USB 2.0 Ethernet",
        .bind = ax88178_bind,
        .unbind = ax88772_unbind,
        .status = asix_status,

You cannot pair ax88178_bind with ax88772_unbind. Either a
ax88178_unbind is needed, or ax88772_unbind needs to check for a NULL
pointer.

	Andrew

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [syzbot] KASAN: null-ptr-deref Read in phy_disconnect
  2021-08-31 14:20   ` Andrew Lunn
@ 2021-08-31 15:30     ` Oleksij Rempel
  2021-08-31 15:34       ` Jakub Kicinski
  0 siblings, 1 reply; 5+ messages in thread
From: Oleksij Rempel @ 2021-08-31 15:30 UTC (permalink / raw)
  To: Andrew Lunn, Jakub Kicinski
  Cc: syzbot, davem, hkallweit1, linux-kernel, linux-usb, linux,
	netdev, syzkaller-bugs

Am 31.08.21 um 16:20 schrieb Andrew Lunn:
> On Tue, Aug 31, 2021 at 06:48:45AM -0700, Jakub Kicinski wrote:
>> On Tue, 31 Aug 2021 03:36:23 -0700 syzbot wrote:
>>> Hello,
>>>
>>> syzbot found the following issue on:
>>>
>>> HEAD commit:    9c1587d99f93 usb: isp1760: otg control register access
>>> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
>>> console output: https://syzkaller.appspot.com/x/log.txt?x=16907291300000
>>> kernel config:  https://syzkaller.appspot.com/x/.config?x=24756feea212a6b0
>>> dashboard link: https://syzkaller.appspot.com/bug?extid=6a916267d9bc5fa2d9a6
>>> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
>>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166de449300000
>>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12c5ddce300000
>>>
>>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>>> Reported-by: syzbot+6a916267d9bc5fa2d9a6@syzkaller.appspotmail.com
>>>
>>> asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
>>> usb 1-1: USB disconnect, device number 2
>>> asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
>>> general protection fault, probably for non-canonical address 0xdffffc00000000c3: 0000 [#1] SMP KASAN
>>> KASAN: null-ptr-deref in range [0x0000000000000618-0x000000000000061f]
>>> CPU: 1 PID: 32 Comm: kworker/1:1 Not tainted 5.14.0-rc7-syzkaller #0
>>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>>> Workqueue: usb_hub_wq hub_event
>>> RIP: 0010:phy_is_started include/linux/phy.h:947 [inline]
>>> RIP: 0010:phy_disconnect+0x22/0x110 drivers/net/phy/phy_device.c:1097
>>> Code: 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 46 33 68 fe 48 8d bd 18 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e c5 00 00 00 8b 9d 18 06 00 00
>>> RSP: 0018:ffffc900001a7780 EFLAGS: 00010206
>>> RAX: dffffc0000000000 RBX: ffff88811a410bc0 RCX: 0000000000000000
>>> RDX: 00000000000000c3 RSI: ffffffff82d9305a RDI: 0000000000000618
>>> RBP: 0000000000000000 R08: 0000000000000055 R09: 0000000000000000
>>> R10: ffffffff814c05fb R11: 0000000000000000 R12: ffff8881063cc300
>>> R13: ffffffff83870d90 R14: ffffffff86805a20 R15: ffffffff868059e0
>>> FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
>>> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>> CR2: 00007fb4c30b3008 CR3: 00000001021e1000 CR4: 00000000001506e0
>>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>>> Call Trace:
>>>  ax88772_unbind+0x51/0x90 drivers/net/usb/asix_devices.c:816
>
> Looking at the console messages:
>
> [   36.456221][   T32] usb 1-1: new high-speed USB device number 2 using dummy_hcd
> [   36.976035][   T32] usb 1-1: New USB device found, idVendor=0df6, idProduct=0056, bcdDevice=42.6c
> [   36.985338][   T32] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> [   36.993579][   T32] usb 1-1: Product: syz
> [   36.997817][   T32] usb 1-1: Manufacturer: syz
> [   37.002423][   T32] usb 1-1: SerialNumber: syz
> [   37.013578][   T32] usb 1-1: config 0 descriptor??
> [   37.276018][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): invalid hw address, using random
> executing program
> [   37.715517][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> [   37.725693][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> [   37.925418][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> [   37.936461][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> [   38.119561][   T32] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
> [   38.138828][   T32] usb 1-1: USB disconnect, device number 2
> [   38.150689][   T32] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
>
> So this is a AX88178, and you would expect it to use
> ax88178_bind(). That function never calls ax88772_init_phy() which is
> what connects the PHY to the MAC, and sets priv->phydev.
>
> static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
> {
>         struct asix_common_private *priv = dev->driver_priv;
>
>         phy_disconnect(priv->phydev);
>
> So this passes a NULL pointer.
>
> static const struct driver_info ax88178_info = {
>         .description = "ASIX AX88178 USB 2.0 Ethernet",
>         .bind = ax88178_bind,
>         .unbind = ax88772_unbind,
>         .status = asix_status,
>
> You cannot pair ax88178_bind with ax88772_unbind. Either a
> ax88178_unbind is needed, or ax88772_unbind needs to check for a NULL
> pointer.
>
> 	Andrew
>

Yes, this was fixed following patch:
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/drivers/net/usb/asix_devices.c?id=1406e8cb4b05fdc67692b1af2da39d7ca5278713

--
Regards,
Oleksij

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [syzbot] KASAN: null-ptr-deref Read in phy_disconnect
  2021-08-31 15:30     ` Oleksij Rempel
@ 2021-08-31 15:34       ` Jakub Kicinski
  0 siblings, 0 replies; 5+ messages in thread
From: Jakub Kicinski @ 2021-08-31 15:34 UTC (permalink / raw)
  To: Oleksij Rempel
  Cc: Andrew Lunn, syzbot, davem, hkallweit1, linux-kernel, linux-usb,
	linux, netdev, syzkaller-bugs

On Tue, 31 Aug 2021 17:30:19 +0200 Oleksij Rempel wrote:
> Am 31.08.21 um 16:20 schrieb Andrew Lunn:
> > On Tue, Aug 31, 2021 at 06:48:45AM -0700, Jakub Kicinski wrote:  
> >> On Tue, 31 Aug 2021 03:36:23 -0700 syzbot wrote:  
>  [...]  
> >
> > Looking at the console messages:
> >
> > [   36.456221][   T32] usb 1-1: new high-speed USB device number 2 using dummy_hcd
> > [   36.976035][   T32] usb 1-1: New USB device found, idVendor=0df6, idProduct=0056, bcdDevice=42.6c
> > [   36.985338][   T32] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > [   36.993579][   T32] usb 1-1: Product: syz
> > [   36.997817][   T32] usb 1-1: Manufacturer: syz
> > [   37.002423][   T32] usb 1-1: SerialNumber: syz
> > [   37.013578][   T32] usb 1-1: config 0 descriptor??
> > [   37.276018][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): invalid hw address, using random
> > executing program
> > [   37.715517][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> > [   37.725693][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> > [   37.925418][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to write reg index 0x0000: -71
> > [   37.936461][   T32] asix 1-1:0.0 (unnamed net_device) (uninitialized): Failed to send software reset: ffffffb9
> > [   38.119561][   T32] asix 1-1:0.0 eth1: register 'asix' at usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet, 8a:c0:d1:1e:27:4c
> > [   38.138828][   T32] usb 1-1: USB disconnect, device number 2
> > [   38.150689][   T32] asix 1-1:0.0 eth1: unregister 'asix' usb-dummy_hcd.0-1, ASIX AX88178 USB 2.0 Ethernet
> >
> > So this is a AX88178, and you would expect it to use
> > ax88178_bind(). That function never calls ax88772_init_phy() which is
> > what connects the PHY to the MAC, and sets priv->phydev.
> >
> > static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
> > {
> >         struct asix_common_private *priv = dev->driver_priv;
> >
> >         phy_disconnect(priv->phydev);
> >
> > So this passes a NULL pointer.
> >
> > static const struct driver_info ax88178_info = {
> >         .description = "ASIX AX88178 USB 2.0 Ethernet",
> >         .bind = ax88178_bind,
> >         .unbind = ax88772_unbind,
> >         .status = asix_status,
> >
> > You cannot pair ax88178_bind with ax88772_unbind. Either a
> > ax88178_unbind is needed, or ax88772_unbind needs to check for a NULL
> > pointer.
> >
> > 	Andrew
> >  
> 
> Yes, this was fixed following patch:
> https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/drivers/net/usb/asix_devices.c?id=1406e8cb4b05fdc67692b1af2da39d7ca5278713

#syz fix: net: usb: asix: do not call phy_disconnect() for ax88178

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2021-08-31 15:34 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-31 10:36 [syzbot] KASAN: null-ptr-deref Read in phy_disconnect syzbot
2021-08-31 13:48 ` Jakub Kicinski
2021-08-31 14:20   ` Andrew Lunn
2021-08-31 15:30     ` Oleksij Rempel
2021-08-31 15:34       ` Jakub Kicinski

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