tree 4741bcdc0b14d1dfe4e2fd40fd15eee4a6155529
parent e95489010b7abf6d360dfb7d88a41dfa9e0cc802
author Lorenzo Colitti <lorenzo@google.com> 1480442207 +0900
committer David S. Miller <davem@davemloft.net> 1480535639 -0500

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.

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>