[VLAN/BRIDGE]: Fix "skb_pull_rcsum - Fatal exception in interrupt"

[linux-2.6-omap-h63xx.git] / net / 8021q / vlan_dev.c

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 4bab322c9f8f9266e7c5fe4c5cb4ac7c63257757..328759c32d616195ff634ad12369667d16e4f80e 100644 (file)
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -116,12 +116,22 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
                  struct packet_type* ptype, struct net_device *orig_dev)
 {
        unsigned char *rawp = NULL;
-       struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data);
+       struct vlan_hdr *vhdr;
        unsigned short vid;
        struct net_device_stats *stats;
        unsigned short vlan_TCI;
        __be16 proto;
 
+       if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+               return -1;
+
+       if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) {
+               kfree_skb(skb);
+               return -1;
+       }
+
+       vhdr = (struct vlan_hdr *)(skb->data);
+
        /* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
        vlan_TCI = ntohs(vhdr->h_vlan_TCI);