netdev - Re: BUG: net/netlink: KASAN: use-after-free in netlink_sock

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Message-ID: <20160527225811.GA23817@gondor.apana.org.au>
Date:	Sat, 28 May 2016 06:58:11 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Baozeng Ding <sploving1@...il.com>,
	David Miller <davem@...emloft.net>, chamaken@...il.com,
	Daniel Borkmann <daniel@...earbox.net>,
	Florian Westphal <fw@...len.de>, dh.herrmann@...il.com,
	christophe.ricard@...il.com,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: BUG: net/netlink: KASAN: use-after-free in netlink_sock_destruct

On Fri, May 27, 2016 at 09:19:48AM -0700, Cong Wang wrote:
>
> This one looks different though, this time the bug is
> triggered in netlink_sock_destruct(), where all the sock
> ref should be gone, which means it is impossible to refer
> nlk->cb anywhere else. Hmm... I have no idea how
> could this happen.

netlink_sock_destruct is one of the two exit paths for cb->skb
so this is consistent with the previous trace.

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