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

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Date:   Sat, 14 Dec 2019 22:52:01 -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)

Hello,

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

Reported-and-tested-by:  
syzbot+4a39a025912b265cacef@...kaller.appspotmail.com

Tested on:

commit:         dfdeeb41 Merge branch 'tt/misc' into dev
git tree:        
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git master
kernel config:  https://syzkaller.appspot.com/x/.config?x=be3b077056d26622
dashboard link: https://syzkaller.appspot.com/bug?extid=4a39a025912b265cacef
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=11b02546e00000

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