linux-ext4 - Re: KASAN: use-after-free Read in ext4_xattr_set

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Date:   Sat, 14 Dec 2019 17:27:00 -0800
From:   syzbot <syzbot+4a39a025912b265cacef@...kaller.appspotmail.com>
To:     a@...table.cc, adilger.kernel@...ger.ca, afd@...com,
        b.a.t.m.a.n@...ts.open-mesh.org, chris@...a.com.au,
        davem@...emloft.net, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, pali.rohar@...il.com, sre@...nel.org,
        sw@...onwunderlich.de, syzkaller-bugs@...glegroups.com,
        tytso@....edu
Subject: Re: KASAN: use-after-free Read in ext4_xattr_set_entry (2)

syzbot has bisected this bug to:

commit 8835cae5f2abd7f7a3143afe357f416aff5517a4
Author: Chris Lapa <chris@...a.com.au>
Date:   Wed Jan 11 01:44:47 2017 +0000

     power: supply: bq27xxx: adds specific support for bq27520-g4 revision.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16661f41e00000
start commit:   ae4b064e Merge tag 'afs-fixes-20191211' of git://git.kerne..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=15661f41e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=11661f41e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
dashboard link: https://syzkaller.appspot.com/bug?extid=4a39a025912b265cacef
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15ec1332e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=163455dee00000

Reported-by: syzbot+4a39a025912b265cacef@...kaller.appspotmail.com
Fixes: 8835cae5f2ab ("power: supply: bq27xxx: adds specific support for  
bq27520-g4 revision.")

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