netdev - Re: KASAN: use-after-free Read in rtnetlink_put

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Message-ID: <18196855-1085-9c70-fc58-fdcbe4060d21@gmail.com>
Date:   Wed, 1 Aug 2018 10:28:54 +0200
From:   David Ahern <dsahern@...il.com>
To:     Sabrina Dubroca <sd@...asysnail.net>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        syzbot+41f9c04b50ef70c66947@...kaller.appspotmail.com,
        christian.brauner@...ntu.com, David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>, Jiri Benc <jbenc@...hat.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        LKML <linux-kernel@...r.kernel.org>,
        lucien xin <lucien.xin@...il.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in rtnetlink_put_metrics

On 8/1/18 10:15 AM, Sabrina Dubroca wrote:
> ip -net peerA route add fec0:B::/64 via fec0:A:: mtu 1300

I am on vacation right now with limited access to internet, so not able
to take a look.

In submitting the fib6_info changes I did tests like this and did not
see memleak reports (and verified the metrics refcnts with printks), so
I am surprised to see your patch in this area. Will take a look when I
can but that will not be for a couple more weeks.