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authorKonstantin Khlebnikov <koct9i@gmail.com>2016-01-08 15:21:46 +0300
committerDavid S. Miller <davem@davemloft.net>2016-01-15 14:35:24 -0500
commit9207f9d45b0ad071baa128e846d7e7ed85016df3 (patch)
tree9053fd455c6a19176174674e898ee05c37724827 /net/ipv4/ip_output.c
parent5d19c619ab3f0551864684f09c2a2f22ee972bef (diff)
downloadlinux-9207f9d45b0ad071baa128e846d7e7ed85016df3.tar.bz2
net: preserve IP control block during GSO segmentation
Skb_gso_segment() uses skb control block during segmentation. This patch adds 32-bytes room for previous control block which will be copied into all resulting segments. This patch fixes kernel crash during fragmenting forwarded packets. Fragmentation requires valid IP CB in skb for clearing ip options. Also patch removes custom save/restore in ovs code, now it's redundant. Signed-off-by: Konstantin Khlebnikov <koct9i@gmail.com> Link: http://lkml.kernel.org/r/CALYGNiP-0MZ-FExV2HutTvE9U-QQtkKSoE--KN=JQE5STYsjAA@mail.gmail.com Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_output.c')
-rw-r--r--net/ipv4/ip_output.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 512a44778cf2..64878efa045c 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -239,6 +239,7 @@ static int ip_finish_output_gso(struct net *net, struct sock *sk,
* from host network stack.
*/
features = netif_skb_features(skb);
+ BUILD_BUG_ON(sizeof(*IPCB(skb)) > SKB_SGO_CB_OFFSET);
segs = skb_gso_segment(skb, features & ~NETIF_F_GSO_MASK);
if (IS_ERR_OR_NULL(segs)) {
kfree_skb(skb);