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

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Message-ID: <000000000000e139ab0596c1d4c0@google.com>
Date:   Thu, 07 Nov 2019 05:42:07 -0800
From:   syzbot <syzbot+999bca54de2ee169c021@...kaller.appspotmail.com>
To:     davem@...emloft.net, dvyukov@...gle.com, frederic@...nel.org,
        fweisbec@...il.com, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        netdev@...r.kernel.org, sbrivio@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        yoshfuji@...ux-ipv6.org
Subject: Re: KASAN: use-after-free Read in tick_sched_handle (3)

syzbot suspects this bug was fixed by commit:

commit bc6e019b6ee65ff4ebf3ca272f774cf6c67db669
Author: Stefano Brivio <sbrivio@...hat.com>
Date:   Thu Jan 3 20:43:34 2019 +0000

     fou: Prevent unbounded recursion in GUE error handler also with UDP-Lite

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=119c0bc2600000
start commit:   1c7fc5cb Linux 5.0-rc2
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=817708c0a0300f84
dashboard link: https://syzkaller.appspot.com/bug?extid=999bca54de2ee169c021
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12c95a30c00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11df0107400000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: fou: Prevent unbounded recursion in GUE error handler also with  
UDP-Lite

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