gre: do not pull header in ICMP error processing

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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: bda7bb4634 ("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>

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Jiri Benc 2016-04-29 23:31:32 +02:00 • committed by David S. Miller

parent 2c94b53738

commit b7f8fe251e

1 changed files with 8 additions and 3 deletions

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net/ipv4/ip_gre.c

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