esp: Fix skb tailroom calculation
authorSteffen Klassert <steffen.klassert@secunet.com>
Fri, 25 Aug 2017 05:34:35 +0000 (07:34 +0200)
committerSteffen Klassert <steffen.klassert@secunet.com>
Fri, 25 Aug 2017 07:26:24 +0000 (09:26 +0200)
commit54ffd790792898f05e215dce5aa593473e80e92f
tree432d194da894dfa6f0911191987e68885235513a
parent36ff0dd39f9b88ca83e1733b735e9f22b7be893b
esp: Fix skb tailroom calculation

We use skb_availroom to calculate the skb tailroom for the
ESP trailer. skb_availroom calculates the tailroom and
subtracts this value by reserved_tailroom. However
reserved_tailroom is a union with the skb mark. This means
that we subtract the tailroom by the skb mark if set.
Fix this by using skb_tailroom instead.

Fixes: cac2661c53f3 ("esp4: Avoid skb_cow_data whenever possible")
Fixes: 03e2a30f6a27 ("esp6: Avoid skb_cow_data whenever possible")
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
net/ipv4/esp4.c
net/ipv6/esp6.c