diff options
Diffstat (limited to 'net/bridge/br_netfilter.c')
| -rw-r--r-- | net/bridge/br_netfilter.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/bridge/br_netfilter.c b/net/bridge/br_netfilter.c index fa779874b9d..3ee2022928e 100644 --- a/net/bridge/br_netfilter.c +++ b/net/bridge/br_netfilter.c @@ -509,8 +509,14 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, int (*okfn)(struct sk_buff *)) { struct iphdr *iph; - __u32 len; struct sk_buff *skb = *pskb; + __u32 len = nf_bridge_encap_header_len(skb); + + if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) + return NF_STOLEN; + + if (unlikely(!pskb_may_pull(skb, len))) + goto out; if (skb->protocol == htons(ETH_P_IPV6) || IS_VLAN_IPV6(skb) || IS_PPPOE_IPV6(skb)) { @@ -518,8 +524,6 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, if (!brnf_call_ip6tables) return NF_ACCEPT; #endif - if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) - goto out; nf_bridge_pull_encap_header_rcsum(skb); return br_nf_pre_routing_ipv6(hook, skb, in, out, okfn); } @@ -532,8 +536,6 @@ static unsigned int br_nf_pre_routing(unsigned int hook, struct sk_buff **pskb, !IS_PPPOE_IP(skb)) return NF_ACCEPT; - if ((skb = skb_share_check(*pskb, GFP_ATOMIC)) == NULL) - goto out; nf_bridge_pull_encap_header_rcsum(skb); if (!pskb_may_pull(skb, sizeof(struct iphdr))) |