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-rw-r--r--include/linux/netfilter_bridge.h14
-rw-r--r--net/bridge/br_forward.c10
2 files changed, 19 insertions, 5 deletions
diff --git a/include/linux/netfilter_bridge.h b/include/linux/netfilter_bridge.h
index 10c13dc4665b..427c67ff89e9 100644
--- a/include/linux/netfilter_bridge.h
+++ b/include/linux/netfilter_bridge.h
@@ -48,15 +48,25 @@ enum nf_br_hook_priorities {
/* Only used in br_forward.c */
static inline
-void nf_bridge_maybe_copy_header(struct sk_buff *skb)
+int nf_bridge_maybe_copy_header(struct sk_buff *skb)
{
+ int err;
+
if (skb->nf_bridge) {
if (skb->protocol == __constant_htons(ETH_P_8021Q)) {
+ err = skb_cow(skb, 18);
+ if (err)
+ return err;
memcpy(skb->data - 18, skb->nf_bridge->data, 18);
skb_push(skb, 4);
- } else
+ } else {
+ err = skb_cow(skb, 16);
+ if (err)
+ return err;
memcpy(skb->data - 16, skb->nf_bridge->data, 16);
+ }
}
+ return 0;
}
/* This is called by the IP fragmenting code and it ensures there is
diff --git a/net/bridge/br_forward.c b/net/bridge/br_forward.c
index 6ccd32b30809..864fbbc7b24d 100644
--- a/net/bridge/br_forward.c
+++ b/net/bridge/br_forward.c
@@ -40,11 +40,15 @@ int br_dev_queue_push_xmit(struct sk_buff *skb)
else {
#ifdef CONFIG_BRIDGE_NETFILTER
/* ip_refrag calls ip_fragment, doesn't copy the MAC header. */
- nf_bridge_maybe_copy_header(skb);
+ if (nf_bridge_maybe_copy_header(skb))
+ kfree_skb(skb);
+ else
#endif
- skb_push(skb, ETH_HLEN);
+ {
+ skb_push(skb, ETH_HLEN);
- dev_queue_xmit(skb);
+ dev_queue_xmit(skb);
+ }
}
return 0;