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

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Date:   Wed, 25 Jan 2023 14:04:17 -0800
From:   syzbot <syzbot+7170d66493145b71afd4@...kaller.appspotmail.com>
To:     Liam.Howlett@...cle.com, brauner@...nel.org,
        dan.carpenter@...cle.com, dvyukov@...gle.com,
        liam.howlett@...cle.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, viro@...iv.linux.org.uk,
        wanjiabing@...o.com, willy@...radead.org
Subject: Re: [syzbot] KASAN: use-after-free Read in mas_next_nentry

syzbot suspects this issue was fixed by commit:

commit 59f2f4b8a757412fce372f6d0767bdb55da127a8
Author: Liam Howlett <liam.howlett@...cle.com>
Date:   Mon Nov 7 20:11:42 2022 +0000

    fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=129e8afe480000
start commit:   b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
dashboard link: https://syzkaller.appspot.com/bug?extid=7170d66493145b71afd4
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11bfb2a9880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10b1d319880000

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

#syz fix: fs/userfaultfd: Fix maple tree iterator in userfaultfd_unregister()

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