linux-kernel - Re: [syzbot] KASAN: use-after-free Read in corrupted (4)

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Message-ID: <000000000000b6b4eb05dfa1b325@google.com>
Date:   Sun, 22 May 2022 16:01:21 -0700
From:   syzbot <syzbot+48135e34de22e3a82c99@...kaller.appspotmail.com>
To:     applications@...nkbigglobal.in, davem@...emloft.net,
        gustavo@...ovan.org, johan.hedberg@...il.com,
        linux-bluetooth@...r.kernel.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, marcel@...tmann.org,
        mingo@...hat.com, mmarek@...e.com, netdev@...r.kernel.org,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, will@...nel.org
Subject: Re: [syzbot] KASAN: use-after-free Read in corrupted (4)

syzbot has found a reproducer for the following issue on:

HEAD commit:    eaea45fc0e7b Merge tag 'perf-tools-fixes-for-v5.18-2022-05..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1315c161f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=902c5209311d387c
dashboard link: https://syzkaller.appspot.com/bug?extid=48135e34de22e3a82c99
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a076d6f00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12f76a3df00000

The issue was bisected to:

commit c470abd4fde40ea6a0846a2beab642a578c0b8cd
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Sun Feb 19 22:34:00 2017 +0000

    Linux 4.10

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=128bb53a900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=118bb53a900000
console output: https://syzkaller.appspot.com/x/log.txt?x=168bb53a900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+48135e34de22e3a82c99@...kaller.appspotmail.com
Fixes: c470abd4fde4 ("Linux 4.10")

traps: syz-executor229[3615] general protection fault ip:7feb96eb56a1 sp:20000fd0 error:0 in syz-executor2295634012[7feb96e75000+84000]