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

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Date:   Wed, 25 Dec 2019 07:26:00 -0800
From:   syzbot <syzbot+f11cda116c57db68c227@...kaller.appspotmail.com>
To:     b.zolnierkie@...sung.com, daniel.vetter@...ll.ch,
        daniel.vetter@...el.com, dri-devel@...ts.freedesktop.org,
        hdanton@...a.com, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
        mojha@...eaurora.org, sam@...nborg.org,
        shile.zhang@...ux.alibaba.com, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in fb_mode_is_equal

syzbot has bisected this bug to:

commit 13ff178ccd6d3b8074c542a911300b79c4eec255
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue May 28 09:02:53 2019 +0000

     fbcon: Call fbcon_mode_deleted/new_modelist directly

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1737c63ee00000
start commit:   46cf053e Linux 5.5-rc3
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=14b7c63ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=10b7c63ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ed9d672709340e35
dashboard link: https://syzkaller.appspot.com/bug?extid=f11cda116c57db68c227
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12bf72c6e00000

Reported-by: syzbot+f11cda116c57db68c227@...kaller.appspotmail.com
Fixes: 13ff178ccd6d ("fbcon: Call fbcon_mode_deleted/new_modelist directly")

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