tree 8d04bffca639fbda3c7b2585ba40822645b9c751
parent 5044292c361587d89bcbec50da260f5ad18c8bd1
author Lorenzo Colitti <lorenzo@google.com> 1480442207 +0900
committer Dmitry Shmidt <dimitrysh@google.com> 1485554160 -0800

UPSTREAM: net: ipv4: Don't crash if passing a null sk to ip_rt_update_pmtu.

Commit e2d118a1cb5e ("net: inet: Support UID-based routing in IP
protocols.") made __build_flow_key call sock_net(sk) to determine
the network namespace of the passed-in socket. This crashes if sk
is NULL.

Fix this by getting the network namespace from the skb instead.

Change-Id: Ife860a7af8471bf40cc987f7803059d7bb9cc7e3
Fixes: e2d118a1cb5e ("net: inet: Support UID-based routing in IP protocols.")
Reported-by: Erez Shitrit <erezsh@dev.mellanox.co.il>
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>