tree 2658e9259ca6a53e07a25fe399a4f61d15093220
parent a1bf1750871a6f242b0fdb174cc55d2c57e7ed66
author Eric Dumazet <edumazet@google.com> 1386802011 -0800
committer David S. Miller <davem@davemloft.net> 1386811270 -0500

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>