From: Eric Dumazet <edumazet@google.com>
Date: Wed, 11 Dec 2013 22:46:51 +0000 (-0800)
Subject: udp: ipv4: must add synchronization in udp_sk_rx_dst_set()
X-Git-Tag: v3.13-rc4~3^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=975022310233fb0f0193873d79a7b8438070fa82;p=pandora-kernel.git

udp: ipv4: must add synchronization in udp_sk_rx_dst_set()

Unlike TCP, UDP input path does not hold the socket lock.

Before messing with sk->sk_rx_dst, we must use a spinlock, otherwise
multiple cpus could leak a refcount.

This patch also takes care of renewing a stale dst entry.
(When the sk->sk_rx_dst would not be used by IP early demux)

Fixes: 421b3885bf6d ("udp: ipv4: Add udp early demux")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed