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* [PATCH v1] net: macb: fix use after free on rmmod
@ 2021-09-07 20:29 Tong Zhang
  2021-09-08  7:27 ` Nicolas.Ferre
  0 siblings, 1 reply; 6+ messages in thread
From: Tong Zhang @ 2021-09-07 20:29 UTC (permalink / raw)
  To: Nicolas Ferre, Claudiu Beznea, David S. Miller, Jakub Kicinski,
	netdev, linux-kernel
  Cc: Tong Zhang

plat_dev->dev->platform_data is released by platform_device_unregister(),
use of pclk and hclk is use after free. This patch keeps a copy to fix
the issue.

[   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
[   31.275563] Freed by task 306:
[   30.276782]  platform_device_release+0x25/0x80

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
 drivers/net/ethernet/cadence/macb_pci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
index 8b7b59908a1a..4dd0cec2e542 100644
--- a/drivers/net/ethernet/cadence/macb_pci.c
+++ b/drivers/net/ethernet/cadence/macb_pci.c
@@ -110,10 +110,12 @@ static void macb_remove(struct pci_dev *pdev)
 {
 	struct platform_device *plat_dev = pci_get_drvdata(pdev);
 	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
+	struct clk *pclk = plat_data->pclk;
+	struct clk *hclk = plat_data->hclk;
 
 	platform_device_unregister(plat_dev);
-	clk_unregister(plat_data->pclk);
-	clk_unregister(plat_data->hclk);
+	clk_unregister(pclk);
+	clk_unregister(hclk);
 }
 
 static const struct pci_device_id dev_id_table[] = {
-- 
2.25.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v1] net: macb: fix use after free on rmmod
  2021-09-07 20:29 [PATCH v1] net: macb: fix use after free on rmmod Tong Zhang
@ 2021-09-08  7:27 ` Nicolas.Ferre
  2021-09-08 19:02   ` [PATCH v2] " Tong Zhang
  2021-09-08 19:02   ` [PATCH v1] " Tong Zhang
  0 siblings, 2 replies; 6+ messages in thread
From: Nicolas.Ferre @ 2021-09-08  7:27 UTC (permalink / raw)
  To: ztong0001, Claudiu.Beznea, davem, kuba, netdev, linux-kernel

On 07/09/2021 at 22:29, Tong Zhang wrote:
> plat_dev->dev->platform_data is released by platform_device_unregister(),
> use of pclk and hclk is use after free. This patch keeps a copy to fix
> the issue.
> 
> [   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
> [   31.275563] Freed by task 306:
> [   30.276782]  platform_device_release+0x25/0x80
> 
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>   drivers/net/ethernet/cadence/macb_pci.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
> index 8b7b59908a1a..4dd0cec2e542 100644
> --- a/drivers/net/ethernet/cadence/macb_pci.c
> +++ b/drivers/net/ethernet/cadence/macb_pci.c
> @@ -110,10 +110,12 @@ static void macb_remove(struct pci_dev *pdev)
>   {
>          struct platform_device *plat_dev = pci_get_drvdata(pdev);
>          struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
> +       struct clk *pclk = plat_data->pclk;
> +       struct clk *hclk = plat_data->hclk;
> 
>          platform_device_unregister(plat_dev);
> -       clk_unregister(plat_data->pclk);
> -       clk_unregister(plat_data->hclk);
> +       clk_unregister(pclk);
> +       clk_unregister(hclk);

NACK, I  would prefer that you switch lines and do clock clk unregister 
before: this way we avoid the problem and I think that you don't need 
clocks for unregistering the platform device anyway.

Please change accordingly or tell me what could go bad.

Regards,
   Nicolas


>   }
> 
>   static const struct pci_device_id dev_id_table[] = {
> --
> 2.25.1
> 


-- 
Nicolas Ferre

^ permalink raw reply	[flat|nested] 6+ messages in thread

* [PATCH v2] net: macb: fix use after free on rmmod
  2021-09-08  7:27 ` Nicolas.Ferre
@ 2021-09-08 19:02   ` Tong Zhang
  2021-09-09  7:53     ` Nicolas Ferre
  2021-09-09 10:00     ` patchwork-bot+netdevbpf
  2021-09-08 19:02   ` [PATCH v1] " Tong Zhang
  1 sibling, 2 replies; 6+ messages in thread
From: Tong Zhang @ 2021-09-08 19:02 UTC (permalink / raw)
  To: Nicolas Ferre, Claudiu Beznea, David S. Miller, Jakub Kicinski,
	netdev, linux-kernel
  Cc: Tong Zhang, Nicolas Ferre

plat_dev->dev->platform_data is released by platform_device_unregister(),
use of pclk and hclk is a use-after-free. Since device unregister won't
need a clk device we adjust the function call sequence to fix this issue.

[   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
[   31.275563] Freed by task 306:
[   30.276782]  platform_device_release+0x25/0x80

Suggested-by: Nicolas Ferre <Nicolas.Ferre@microchip.com>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
v2: switch lines to fix the issue instead

 drivers/net/ethernet/cadence/macb_pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
index 8b7b59908a1a..f66d22de5168 100644
--- a/drivers/net/ethernet/cadence/macb_pci.c
+++ b/drivers/net/ethernet/cadence/macb_pci.c
@@ -111,9 +111,9 @@ static void macb_remove(struct pci_dev *pdev)
 	struct platform_device *plat_dev = pci_get_drvdata(pdev);
 	struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
 
-	platform_device_unregister(plat_dev);
 	clk_unregister(plat_data->pclk);
 	clk_unregister(plat_data->hclk);
+	platform_device_unregister(plat_dev);
 }
 
 static const struct pci_device_id dev_id_table[] = {
-- 
2.25.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v1] net: macb: fix use after free on rmmod
  2021-09-08  7:27 ` Nicolas.Ferre
  2021-09-08 19:02   ` [PATCH v2] " Tong Zhang
@ 2021-09-08 19:02   ` Tong Zhang
  1 sibling, 0 replies; 6+ messages in thread
From: Tong Zhang @ 2021-09-08 19:02 UTC (permalink / raw)
  To: Nicolas Ferre
  Cc: Claudiu Beznea, David S. Miller, Jakub Kicinski, Netdev, open list

Thanks Nicolas, sent a v2 as suggested.
- Tong

On Wed, Sep 8, 2021 at 12:27 AM <Nicolas.Ferre@microchip.com> wrote:
>
> On 07/09/2021 at 22:29, Tong Zhang wrote:
> > plat_dev->dev->platform_data is released by platform_device_unregister(),
> > use of pclk and hclk is use after free. This patch keeps a copy to fix
> > the issue.
> >
> > [   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
> > [   31.275563] Freed by task 306:
> > [   30.276782]  platform_device_release+0x25/0x80
> >
> > Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> > ---
> >   drivers/net/ethernet/cadence/macb_pci.c | 6 ++++--
> >   1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
> > index 8b7b59908a1a..4dd0cec2e542 100644
> > --- a/drivers/net/ethernet/cadence/macb_pci.c
> > +++ b/drivers/net/ethernet/cadence/macb_pci.c
> > @@ -110,10 +110,12 @@ static void macb_remove(struct pci_dev *pdev)
> >   {
> >          struct platform_device *plat_dev = pci_get_drvdata(pdev);
> >          struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
> > +       struct clk *pclk = plat_data->pclk;
> > +       struct clk *hclk = plat_data->hclk;
> >
> >          platform_device_unregister(plat_dev);
> > -       clk_unregister(plat_data->pclk);
> > -       clk_unregister(plat_data->hclk);
> > +       clk_unregister(pclk);
> > +       clk_unregister(hclk);
>
> NACK, I  would prefer that you switch lines and do clock clk unregister
> before: this way we avoid the problem and I think that you don't need
> clocks for unregistering the platform device anyway.
>
> Please change accordingly or tell me what could go bad.
>
> Regards,
>    Nicolas
>
>
> >   }
> >
> >   static const struct pci_device_id dev_id_table[] = {
> > --
> > 2.25.1
> >
>
>
> --
> Nicolas Ferre

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] net: macb: fix use after free on rmmod
  2021-09-08 19:02   ` [PATCH v2] " Tong Zhang
@ 2021-09-09  7:53     ` Nicolas Ferre
  2021-09-09 10:00     ` patchwork-bot+netdevbpf
  1 sibling, 0 replies; 6+ messages in thread
From: Nicolas Ferre @ 2021-09-09  7:53 UTC (permalink / raw)
  To: Tong Zhang, Claudiu Beznea, David S. Miller, Jakub Kicinski,
	netdev, linux-kernel

On 08/09/2021 at 21:02, Tong Zhang wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> plat_dev->dev->platform_data is released by platform_device_unregister(),
> use of pclk and hclk is a use-after-free. Since device unregister won't
> need a clk device we adjust the function call sequence to fix this issue.
> 
> [   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
> [   31.275563] Freed by task 306:
> [   30.276782]  platform_device_release+0x25/0x80
> 
> Suggested-by: Nicolas Ferre <Nicolas.Ferre@microchip.com>
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>

Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>

Thanks Tong Zhang.
Regards,
   Nicolas

> ---
> v2: switch lines to fix the issue instead
> 
>   drivers/net/ethernet/cadence/macb_pci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_pci.c b/drivers/net/ethernet/cadence/macb_pci.c
> index 8b7b59908a1a..f66d22de5168 100644
> --- a/drivers/net/ethernet/cadence/macb_pci.c
> +++ b/drivers/net/ethernet/cadence/macb_pci.c
> @@ -111,9 +111,9 @@ static void macb_remove(struct pci_dev *pdev)
>          struct platform_device *plat_dev = pci_get_drvdata(pdev);
>          struct macb_platform_data *plat_data = dev_get_platdata(&plat_dev->dev);
> 
> -       platform_device_unregister(plat_dev);
>          clk_unregister(plat_data->pclk);
>          clk_unregister(plat_data->hclk);
> +       platform_device_unregister(plat_dev);
>   }
> 
>   static const struct pci_device_id dev_id_table[] = {
> --
> 2.25.1
> 


-- 
Nicolas Ferre

^ permalink raw reply	[flat|nested] 6+ messages in thread

* Re: [PATCH v2] net: macb: fix use after free on rmmod
  2021-09-08 19:02   ` [PATCH v2] " Tong Zhang
  2021-09-09  7:53     ` Nicolas Ferre
@ 2021-09-09 10:00     ` patchwork-bot+netdevbpf
  1 sibling, 0 replies; 6+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-09-09 10:00 UTC (permalink / raw)
  To: Tong Zhang
  Cc: nicolas.ferre, claudiu.beznea, davem, kuba, netdev, linux-kernel,
	Nicolas.Ferre

Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Wed,  8 Sep 2021 12:02:32 -0700 you wrote:
> plat_dev->dev->platform_data is released by platform_device_unregister(),
> use of pclk and hclk is a use-after-free. Since device unregister won't
> need a clk device we adjust the function call sequence to fix this issue.
> 
> [   31.261225] BUG: KASAN: use-after-free in macb_remove+0x77/0xc6 [macb_pci]
> [   31.275563] Freed by task 306:
> [   30.276782]  platform_device_release+0x25/0x80
> 
> [...]

Here is the summary with links:
  - [v2] net: macb: fix use after free on rmmod
    https://git.kernel.org/netdev/net/c/d82d5303c4c5

You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-09-09 10:00 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-07 20:29 [PATCH v1] net: macb: fix use after free on rmmod Tong Zhang
2021-09-08  7:27 ` Nicolas.Ferre
2021-09-08 19:02   ` [PATCH v2] " Tong Zhang
2021-09-09  7:53     ` Nicolas Ferre
2021-09-09 10:00     ` patchwork-bot+netdevbpf
2021-09-08 19:02   ` [PATCH v1] " Tong Zhang

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