Re: KASAN: use-after-free Read in hidinput_hid_event

[Andrey Konovalov]

On Wed, Dec 18, 2019 at 4:15 PM syzbot
<syzbot+c961cb836a707f66e2f8@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    d533c992 usb: core: kcov: collect coverage from usb comple..
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=100798b9e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=743b91162e9f9496
> dashboard link: https://syzkaller.appspot.com/bug?extid=c961cb836a707f66e2f8
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15519951e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=166f72fee00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+c961cb836a707f66e2f8@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ==================================================================
> BUG: KASAN: use-after-free in test_bit
> include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
> BUG: KASAN: use-after-free in hidinput_hid_event+0x1111/0x15d3
> drivers/hid/hid-input.c:1381
> Read of size 8 at addr ffff8881cfb19738 by task swapper/0/0
>
> CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc2-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
>   <IRQ>
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0xef/0x16e lib/dump_stack.c:118
>   print_address_description.constprop.0+0x16/0x200 mm/kasan/report.c:374
>   __kasan_report.cold+0x37/0x7f mm/kasan/report.c:506
>   kasan_report+0xe/0x20 mm/kasan/common.c:639
>   check_memory_region_inline mm/kasan/generic.c:185 [inline]
>   check_memory_region+0x152/0x1c0 mm/kasan/generic.c:192
>   test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline]
>   hidinput_hid_event+0x1111/0x15d3 drivers/hid/hid-input.c:1381
>   hid_process_event+0x4a0/0x580 drivers/hid/hid-core.c:1506
>   hid_input_field drivers/hid/hid-core.c:1550 [inline]
>   hid_report_raw_event+0xabb/0xed0 drivers/hid/hid-core.c:1757
>   hid_input_report+0x315/0x3f0 drivers/hid/hid-core.c:1824
>   hid_irq_in+0x50e/0x690 drivers/hid/usbhid/hid-core.c:284
>   __usb_hcd_giveback
>
>
> ---
> This bug 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@xxxxxxxxxxxxxxxxx
>
> syzbot will keep track of this bug report. See:
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> syzbot can test patches for this bug, for details see:
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#syz dup: KASAN: global-out-of-bounds Write in kbd_event