net: dsa: tag_qca: Make sure there is headroom for tag

Passing tag size to skb_cow_head will make sure there is enough headroom for the tag data. This change does not introduce any overhead in case there is already available headroom for tag. Signed-off-by: Per Forlin <[email protected]> Reviewed-by: Florian Fainelli <[email protected]> Signed-off-by: David S. Miller <[email protected]>
josf · Feb 14, 2020 · 04fb912 · 04fb912
1 parent 5fdcce2
commit 04fb912
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
@@ -33,7 +33,7 @@ static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
 	struct dsa_port *dp = dsa_slave_to_port(dev);
 	u16 *phdr, hdr;
 
-	if (skb_cow_head(skb, 0) < 0)
+	if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
 		return NULL;
 
 	skb_push(skb, QCA_HDR_LEN);