netdev - Re: BUG: use-after-free in netlink

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Message-Id: <20160516.220557.521063173502741385.davem@davemloft.net>
Date:	Mon, 16 May 2016 22:05:57 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	xiyou.wangcong@...il.com, sploving1@...il.com, chamaken@...il.com,
	daniel@...earbox.net, netdev@...r.kernel.org, fuzzyer0@...il.com,
	pshelar@...ira.com
Subject: Re: BUG: use-after-free in netlink_dump

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Mon, 16 May 2016 17:28:16 +0800

> Subject: netlink: Fix dump skb leak/double free
> 
> When we free cb->skb after a dump, we do it after releasing the
> lock.  This means that a new dump could have started in the time
> being and we'll end up freeing their skb instead of ours.
> 
> This patch saves the skb and module before we unlock so we free
> the right memory.
> 
> Fixes: 16b304f3404f ("netlink: Eliminate kmalloc in netlink dump operation.")
> Reported-by: Baozeng Ding <sploving1@...il.com>
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied and queued up for -stable, thanks.