[VLAN]: Do not modify the data of shared SKBs.

a88930cc · Tommy Christensen · David S. Miller · 024753b7 · a88930cc
Commit a88930cc authored Oct 07, 2003 by Tommy Christensen Committed by David S. Miller Oct 07, 2003
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net/8021q/vlan_dev.c net/8021q/vlan_dev.c +5 -1

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--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -74,7 +74,11 @@ int vlan_dev_rebuild_header(struct sk_buff *skb)
 static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
 {
 	if (VLAN_DEV_INFO(skb->dev)->flags & 1) {
-		skb = skb_share_check(skb, GFP_ATOMIC);
+		if (skb_shared(skb) || skb_cloned(skb)) {
+			struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
+			kfree(skb);
+			skb = nskb;
+		}
 		if (skb) {
 			/* Lifted from Gleb's VLAN code... */
 			memmove(skb->data - ETH_HLEN,