netdev - Re: [PATCH v2] ipv4: dst_entry leak in ip_append

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Date:	Tue, 14 Oct 2014 16:12:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	vvs@...allels.com
Cc:	netdev@...r.kernel.org, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, eric.dumazet@...il.com
Subject: Re: [PATCH v2] ipv4: dst_entry leak in ip_append_data()

From: Vasily Averin <vvs@...allels.com>
Date: Tue, 14 Oct 2014 08:57:14 +0400

> v2: adjust the indentation of the arguments __ip_append_data() call
> 
> Fixes: 2e77d89b2fa8 ("net: avoid a pair of dst_hold()/dst_release() in ip_append_data()")
> 
> If sk_write_queue is empty ip_append_data() executes ip_setup_cork()
> that "steals" dst entry from rt to cork. Later it calls __ip_append_data()
> that creates skb and adds it to sk_write_queue.
> 
> If skb was added successfully following ip_push_pending_frames() call
> reassign dst entries from cork to skb, and kfree_skb frees dst_entry.
> 
> However nobody frees stolen dst_entry if skb was not added into sk_write_queue.
> 
> Signed-off-by: Vasily Averin <vvs@...allels.com>

Why doesn't ip_make_skb() need the same fix?  It seems to do the same
thing.

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