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authorPatrick McHardy <kaber@trash.net>2007-07-10 02:33:40 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-11 09:19:05 +0400
commitcfbba49d80be6cf8d3872b66fc5421f119843b36 (patch)
tree2e2a966d43b6cd80c2ae7c8d5e37ab4c8a0262ad /net/ipv6/sit.c
parent4839c52b01ca91be1c62761e08fb3deb3881e857 (diff)
downloadlinux-cfbba49d80be6cf8d3872b66fc5421f119843b36.tar.xz
[NET]: Avoid copying writable clones in tunnel drivers
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/sit.c')
-rw-r--r--net/ipv6/sit.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 1efa95a99f45..eb20bb690abd 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -532,7 +532,8 @@ static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
*/
max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr);
- if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) {
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
if (!new_skb) {
ip_rt_put(rt);