Re: WARNING: refcount bug in chrdev_open

[Andrey Konovalov]

On Mon, Jan 13, 2020 at 9:02 PM syzbot
<syzbot+1c85a21f1c6bc88eb388@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot suspects this bug was fixed by commit:
>
> commit 68faa679b8be1a74e6663c21c3a9d25d32f1c079
> Author: Will Deacon <will@xxxxxxxxxx>
> Date:   Thu Dec 19 12:02:03 2019 +0000
>
>      chardev: Avoid potential use-after-free in 'chrdev_open()'
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14412659e00000
> start commit:   81b6b964 Merge branch 'master' of git://git.kernel.org/pub..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d98e4bd76baeb821
> dashboard link: https://syzkaller.appspot.com/bug?extid=1c85a21f1c6bc88eb388
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=147ad0a6e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15483312e00000
>
> If the result looks correct, please mark the bug fixed by replying with:
>
> #syz fix: chardev: Avoid potential use-after-free in 'chrdev_open()'

#syz fix: chardev: Avoid potential use-after-free in 'chrdev_open()'

>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
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