linux-kernel - Re: KASAN: use-after-free Write in tcindex

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Message-ID: <00000000000000c55c05a3813a66@google.com>
Date:   Fri, 17 Apr 2020 12:05:02 -0700
From:   syzbot <syzbot+ba4bcf1563f90386910f@...kaller.appspotmail.com>
To:     davem@...emloft.net, jhs@...atatu.com, jiri@...nulli.us,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        xiyou.wangcong@...il.com
Subject: Re: KASAN: use-after-free Write in tcindex_change

syzbot suspects this bug was fixed by commit:

commit 0d1c3530e1bd38382edef72591b78e877e0edcd3
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Thu Mar 12 05:42:28 2020 +0000

    net_sched: keep alloc_hash updated after hash allocation

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15a956d7e00000
start commit:   ac309e77 Merge branch 'for-linus' of git://git.kernel.org/..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=6dfa02302d6db985
dashboard link: https://syzkaller.appspot.com/bug?extid=ba4bcf1563f90386910f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1771b973e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1248a61de00000

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

#syz fix: net_sched: keep alloc_hash updated after hash allocation

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