linux-kernel - Re: [syzbot] KASAN: use-after-free Read in ext4_xattr_set

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Date:   Wed, 23 Mar 2022 08:07:15 -0700
From:   syzbot <syzbot+4cb1e27475bf90a9b926@...kaller.appspotmail.com>
To:     adilger.kernel@...ger.ca, cmaiolino@...hat.com,
        lczerner@...hat.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, sjc@...bot.com,
        syzkaller-bugs@...glegroups.com, tytso@....edu, wanjiabing@...o.com
Subject: Re: [syzbot] KASAN: use-after-free Read in ext4_xattr_set_entry (4)

syzbot suspects this issue was fixed by commit:

commit 6e47a3cc68fc525428297a00524833361ebbb0e9
Author: Lukas Czerner <lczerner@...hat.com>
Date:   Wed Oct 27 14:18:52 2021 +0000

    ext4: get rid of super block and sbi from handle_mount_ops()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=100bc10b700000
start commit:   f8ad8187c3b5 fs/pipe: allow sendfile() to pipe again
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=96b123631a6700e9
dashboard link: https://syzkaller.appspot.com/bug?extid=4cb1e27475bf90a9b926
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11131f94d00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15c3761b500000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: ext4: get rid of super block and sbi from handle_mount_ops()

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