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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>,
	Thomas Graf <tgraf@suug.ch>,
	syzbot <syzbot+bc5ab0af2dbf3b0ae897@syzkaller.appspotmail.com>,
	bridge@lists.linux-foundation.org,
	David Miller <davem@davemloft.net>,
	LKML <linux-kernel@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	Roopa Prabhu <roopa@cumulusnetworks.com>,
	syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Subject: Re: KASAN: use-after-free Read in br_mdb_ip_get
Date: Wed, 29 May 2019 22:58:45 +0800	[thread overview]
Message-ID: <20190529145845.bcvuc5ows4dedqh3@gondor.apana.org.au> (raw)
In-Reply-To: <CACT4Y+bUTWcvqEebNjoagw0JtM77NXwVu+i3cYmhgnntZRWyfg@mail.gmail.com>

Hi Dmitry:

On Thu, Feb 21, 2019 at 11:54:42AM +0100, Dmitry Vyukov wrote:
>
> Taking into account that this still happened only once, I tend to
> write it off onto a previous silent memory corruption (we have dozens
> of known bugs that corrupt memory). So if several people already
> looked at it and don't see the root cause, it's probably time to stop
> spending time on this until we have more info.
> 
> Although, there was also this one:
> https://groups.google.com/d/msg/syzkaller-bugs/QfCCSxdB1aM/y2cn9IZJCwAJ
> I have not checked if it can be the root cause of this report, but it
> points suspiciously close to this stack and when I looked at it, it
> the report looked legit.

Have you had any more reports of this kind coming from br_multicast?

It looks like

ommit 1515a63fc413f160d20574ab0894e7f1020c7be2
Author: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Date:   Wed Apr 3 23:27:24 2019 +0300

    net: bridge: always clear mcast matching struct on reports and leaves

may have at least fixed the uninitialised value error.

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  reply	other threads:[~2019-05-29 14:59 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-27 20:26 syzbot
2019-01-27 21:34 ` Nikolay Aleksandrov
2019-01-28  8:28   ` Dmitry Vyukov
2019-02-20 10:23     ` Herbert Xu
2019-02-21 10:54       ` Dmitry Vyukov
2019-05-29 14:58         ` Herbert Xu [this message]
2019-05-29 15:14           ` Dmitry Vyukov
2019-05-29 15:26             ` Herbert Xu
2019-05-31 11:31               ` Dmitry Vyukov

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