tree 2c1fec745c1ddb827e787b68e16b8ca987874aeb
parent 2c94b53738549d81dc7464a32117d1f5112c64d3
author Jiri Benc <jbenc@redhat.com> 1461965492 +0200
committer David S. Miller <davem@davemloft.net> 1462162798 -0400

gre: do not pull header in ICMP error processing

iptunnel_pull_header expects that IP header was already pulled; with this
expectation, it pulls the tunnel header. This is not true in gre_err.
Furthermore, ipv4_update_pmtu and ipv4_redirect expect that skb->data points
to the IP header.

We cannot pull the tunnel header in this path. It's just a matter of not
calling iptunnel_pull_header - we don't need any of its effects.

Fixes: bda7bb463436 ("gre: Allow multiple protocol listener for gre protocol.")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>