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

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Message-ID: <0000000000000f13e105946c89e9@google.com>
Date:   Tue, 08 Oct 2019 14:06:00 -0700
From:   syzbot <syzbot+dbe02e13bcce52bcf182@...kaller.appspotmail.com>
To:     Ying.Xue@...driver.com, davem@...emloft.net, jiri@...lanox.com,
        jon.maloy@...csson.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tipc-discussion@...ts.sourceforge.net, ying.xue@...driver.com
Subject: Re: KASAN: use-after-free Read in tipc_udp_nl_dump_remoteip

syzbot has bisected this bug to:

commit 057af70713445fad2459aa348c9c2c4ecf7db938
Author: Jiri Pirko <jiri@...lanox.com>
Date:   Sat Oct 5 18:04:39 2019 +0000

     net: tipc: have genetlink code to parse the attrs during dumpit

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11675620e00000
start commit:   056ddc38 Merge branch 'stmmac-next'
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13675620e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15675620e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9be300620399522
dashboard link: https://syzkaller.appspot.com/bug?extid=dbe02e13bcce52bcf182
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=137ecdfb600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15dd0d0b600000

Reported-by: syzbot+dbe02e13bcce52bcf182@...kaller.appspotmail.com
Fixes: 057af7071344 ("net: tipc: have genetlink code to parse the attrs  
during dumpit")

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