linux-ext4 - Re: UBSAN: shift-out-of-bounds in ext4_fill

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Date:   Thu, 10 Dec 2020 11:24:03 -0800
From:   syzbot <syzbot+345b75652b1d24227443@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, clang-built-linux@...glegroups.com,
        dvyukov@...gle.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, natechancellor@...il.com,
        ndesaulniers@...gle.com, syzkaller-bugs@...glegroups.com,
        tytso@....edu
Subject: Re: UBSAN: shift-out-of-bounds in ext4_fill_super

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+345b75652b1d24227443@...kaller.appspotmail.com

Tested on:

commit:         e360ba58 ext4: fix a memory leak of ext4_free_data
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
kernel config:  https://syzkaller.appspot.com/x/.config?x=fe9725f8845d9fe6
dashboard link: https://syzkaller.appspot.com/bug?extid=345b75652b1d24227443
compiler:       gcc (GCC) 10.1.0-syz 20200507
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1166cf17500000

Note: testing is done by a robot and is best-effort only.