linux-kernel - Re: KASAN: slab-out-of-bounds Read in ip6_tnl_parse_tlv_enc

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Date:   Mon, 18 Nov 2019 03:35:00 -0800
From:   syzbot <syzbot+68dce7caebd8543121de@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, ast@...nel.org, boqun.feng@...il.com,
        byungchul.park@....com, daniel@...earbox.net, davem@...emloft.net,
        kernel-team@....com, kirill@...temov.name, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mingo@...nel.org,
        netdev@...r.kernel.org, npiggin@...il.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, walken@...gle.com,
        willy@...radead.org, yoshfuji@...ux-ipv6.org
Subject: Re: KASAN: slab-out-of-bounds Read in ip6_tnl_parse_tlv_enc_lim

syzbot has bisected this bug to:

commit a10b5c564741cd3b6708f085a1fa892b63c2063d
Author: Byungchul Park <byungchul.park@....com>
Date:   Mon Aug 14 07:00:51 2017 +0000

     locking/lockdep: Add a comment about crossrelease_hist_end() in  
lockdep_sys_exit()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1026190ce00000
start commit:   3a5af36b Merge tag '4.19-rc3-smb3-cifs' of git://git.samba..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1226190ce00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1426190ce00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9c4a80625153107e
dashboard link: https://syzkaller.appspot.com/bug?extid=68dce7caebd8543121de
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1068a44e400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=146386c6400000

Reported-by: syzbot+68dce7caebd8543121de@...kaller.appspotmail.com
Fixes: a10b5c564741 ("locking/lockdep: Add a comment about  
crossrelease_hist_end() in lockdep_sys_exit()")

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