From: Cong Wang <xiyou.wangcong@gmail.com>
To: Sabrina Dubroca <sd@queasysnail.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>,
syzbot+41f9c04b50ef70c66947@syzkaller.appspotmail.com,
christian.brauner@ubuntu.com, David Miller <davem@davemloft.net>,
David Ahern <dsahern@gmail.com>, Florian Westphal <fw@strlen.de>,
Jiri Benc <jbenc@redhat.com>, Kirill Tkhai <ktkhai@virtuozzo.com>,
LKML <linux-kernel@vger.kernel.org>,
lucien xin <lucien.xin@gmail.com>,
Linux Kernel Network Developers <netdev@vger.kernel.org>,
syzkaller-bugs@googlegroups.com
Subject: Re: KASAN: use-after-free Read in rtnetlink_put_metrics
Date: Tue, 31 Jul 2018 16:03:13 -0700 [thread overview]
Message-ID: <CAM_iQpURKOMAaPfs9v7FzhqqQPzj71sQD2LS0eU8cuqTML-YoA@mail.gmail.com> (raw)
In-Reply-To: <20180731134014.GA32114@bistromath.localdomain>
On Tue, Jul 31, 2018 at 6:41 AM Sabrina Dubroca <sd@queasysnail.net> wrote:
>
> 2018-07-31, 05:41:56 -0700, Eric Dumazet wrote:
> >
> >
> > On 07/31/2018 05:31 AM, syzbot wrote:
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: 61f4b23769f0 netlink: Don't shift with UB on nlk->ngroups
> > > git tree: net
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=14a9de58400000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=ffb4428fdc82f93b
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=41f9c04b50ef70c66947
> > > compiler: gcc (GCC) 8.0.1 20180413 (experimental)
> > >
> > > Unfortunately, I don't have any reproducer for this crash yet.
> [...]
>
> > Probably also caused by :
> >
> >
> > commit df18b50448fab1dff093731dfd0e25e77e1afcd1
> > Author: Sabrina Dubroca <sd@queasysnail.net>
> > Date: Mon Jul 30 16:23:10 2018 +0200
> >
> > net/ipv6: fix metrics leak
>
> Yeah, I'm looking into both those reports :/
Looks like this commit is completely unnecessary,
fib6_drop_pcpu_from() calls fib6_info_release()
which calls fib6_info_destroy_rcu(), so this metrics
will be released twice...
next prev parent reply other threads:[~2018-07-31 23:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-31 12:31 KASAN: use-after-free Read in rtnetlink_put_metrics syzbot
2018-07-31 12:41 ` Eric Dumazet
2018-07-31 13:40 ` Sabrina Dubroca
2018-07-31 21:53 ` David Miller
2018-07-31 23:03 ` Cong Wang [this message]
2018-08-01 8:15 ` Sabrina Dubroca
2018-08-01 8:28 ` David Ahern
2018-08-02 5:23 ` Cong Wang
2018-08-01 18:46 ` David Miller
2018-08-01 19:26 ` Sabrina Dubroca
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