linux-kernel - Re: KASAN: use-after-free Read in __wake_up_common

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Message-ID: <6f9de558-6447-b64d-33c2-77bfc9f7aec6@gmail.com>
Date:   Tue, 5 Feb 2019 19:42:06 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot <syzbot+fb065bc06d3d4054be6f@...kaller.appspotmail.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Karsten Keil <isdn@...ux-pingi.de>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in __wake_up_common_lock



On 02/05/2019 07:28 PM, Dmitry Vyukov wrote:
> On Wed, Jan 30, 2019 at 10:02 PM syzbot
> <syzbot+fb065bc06d3d4054be6f@...kaller.appspotmail.com> wrote:
>>
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    62967898789d Merge git://git.kernel.org/pub/scm/linux/kern..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=10f0bf08c00000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=4fceea9e2d99ac20
>> dashboard link: https://syzkaller.appspot.com/bug?extid=fb065bc06d3d4054be6f
>> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>>
>> Unfortunately, I don't have any reproducer for this crash yet.
>>
>> IMPORTANT: if you fix the bug, please add the following tag to the commit:
>> Reported-by: syzbot+fb065bc06d3d4054be6f@...kaller.appspotmail.com
> 
> I assume this is also fixed by:
> 
> #syz fix: mISDN: fix a race in dev_expire_timer()

Yes this looks very probable, thanks.