linux-kernel - Re: KASAN: use-after-free Read in bitmap_ip_ext

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Message-ID: <000000000000908c50059ee9173a@google.com>
Date:   Tue, 18 Feb 2020 23:54:03 -0800
From:   syzbot <syzbot+b554d01b6c7870b17da2@...kaller.appspotmail.com>
To:     a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        bridge@...ts.linux-foundation.org, coreteam@...filter.org,
        davem@...emloft.net, florent.fourcot@...irst.fr, fw@...len.de,
        jeremy@...zel.net, johannes.berg@...el.com,
        kadlec@...ckhole.kfki.hu, kadlec@...filter.org,
        linux-kernel@...r.kernel.org, mareklindner@...mailbox.ch,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        nikolay@...ulusnetworks.com, pablo@...filter.org,
        roopa@...ulusnetworks.com, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in bitmap_ip_ext_cleanup

syzbot suspects this bug was fixed by commit:

commit 32c72165dbd0e246e69d16a3ad348a4851afd415
Author: Kadlecsik József <kadlec@...ckhole.kfki.hu>
Date:   Sun Jan 19 21:06:49 2020 +0000

    netfilter: ipset: use bitmap infrastructure completely

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17079245e00000
start commit:   8f8972a3 Merge tag 'mtd/fixes-for-5.5-rc7' of git://git.ke..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4
dashboard link: https://syzkaller.appspot.com/bug?extid=b554d01b6c7870b17da2
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=145948d6e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16202cc9e00000

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

#syz fix: netfilter: ipset: use bitmap infrastructure completely

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