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

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Message-ID: <0000000000001a1eb005847ee152@google.com>
Date:   Tue, 19 Mar 2019 21:16:00 -0700
From:   syzbot <syzbot+d4503ae45b65c5bc1194@...kaller.appspotmail.com>
To:     alsa-devel-bounces@...a-project.org, alsa-devel@...a-project.org,
        dan.carpenter@...cle.com, gustavo@...eddedor.com, joe@...ches.com,
        liam.r.girdwood@...ux.intel.com, linux-kernel@...r.kernel.org,
        o-takashi@...amocchi.jp, pasqualirb@...il.com, perex@...ex.cz,
        syzkaller-bugs@...glegroups.com, tiwai@...e.com, tiwai@...e.de,
        twischer@...adit-jv.com, vkoul@...nel.org
Subject: Re: KASAN: slab-out-of-bounds Read in default_write_copy_kernel

syzbot has bisected this bug to:

commit 65766ee0bf7fe8b3be80e2e1c3ef54ad59b29476
Author: Takashi Iwai <tiwai@...e.de>
Date:   Fri Nov 9 10:59:45 2018 +0000

     ALSA: oss: Use kvzalloc() for local buffer allocations

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11c3005d200000
start commit:   65766ee0 ALSA: oss: Use kvzalloc() for local buffer alloca..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13c3005d200000
console output: https://syzkaller.appspot.com/x/log.txt?x=15c3005d200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446
dashboard link: https://syzkaller.appspot.com/bug?extid=d4503ae45b65c5bc1194
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1789354d400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=162ebe2b400000

Reported-by: syzbot+d4503ae45b65c5bc1194@...kaller.appspotmail.com
Fixes: 65766ee0 ("ALSA: oss: Use kvzalloc() for local buffer allocations")