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* memory leak in rw_copy_check_uvector
@ 2020-08-21 16:58 syzbot
  0 siblings, 0 replies; only message in thread
From: syzbot @ 2020-08-21 16:58 UTC (permalink / raw)
  To: linux-fsdevel, linux-kernel, syzkaller-bugs, viro


syzbot found the following issue on:

HEAD commit:    da2968ff Merge tag 'pci-v5.9-fixes-1' of git://git.kernel...
git tree:       upstream
console output:
kernel config:
dashboard link:
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:
C reproducer:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

BUG: memory leak
unreferenced object 0xffff88811c405400 (size 1024):
  comm "syz-executor386", pid 6503, jiffies 4294942347 (age 13.130s)
  hex dump (first 32 bytes):
    00 01 00 20 00 00 00 00 14 00 00 00 00 00 00 00  ... ............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    [<000000001a62dd57>] kmalloc_array include/linux/slab.h:594 [inline]
    [<000000001a62dd57>] rw_copy_check_uvector+0x171/0x1a0 fs/read_write.c:812
    [<0000000016ad020b>] import_iovec+0x4a/0x140 lib/iov_iter.c:1681
    [<00000000fb58399a>] io_import_iovec+0x271/0x640 fs/io_uring.c:2879
    [<0000000002d03b50>] io_rw_prep_async fs/io_uring.c:3006 [inline]
    [<0000000002d03b50>] io_read_prep+0x94/0xf0 fs/io_uring.c:3031
    [<000000008ab01d5d>] io_req_defer_prep fs/io_uring.c:5462 [inline]
    [<000000008ab01d5d>] io_req_defer_prep+0x1c6/0x720 fs/io_uring.c:5442
    [<0000000075ed8a70>] io_submit_sqe fs/io_uring.c:6262 [inline]
    [<0000000075ed8a70>] io_submit_sqes+0x306/0xc00 fs/io_uring.c:6488
    [<00000000d1d617da>] __do_sys_io_uring_enter+0x582/0x830 fs/io_uring.c:8265
    [<00000000334cee0e>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000053cdb89f>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

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