linux-kernel - Re: WARNING: refcount bug in chrdev

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Date:   Tue, 14 Jan 2020 13:47:26 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     syzbot <syzbot+1c85a21f1c6bc88eb388@...kaller.appspotmail.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fsdevel@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Will Deacon <will@...nel.org>
Subject: Re: WARNING: refcount bug in chrdev_open

On Mon, Jan 13, 2020 at 9:02 PM syzbot
<syzbot+1c85a21f1c6bc88eb388@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this bug was fixed by commit:
>
> commit 68faa679b8be1a74e6663c21c3a9d25d32f1c079
> Author: Will Deacon <will@...nel.org>
> 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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