From: Per Forlin <per.forlin@axis.com>
Date: Thu, 13 Feb 2020 14:37:09 +0000 (+0100)
Subject: net: dsa: tag_qca: Make sure there is headroom for tag
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=04fb91243a853dbde216d829c79d9632e52aa8d9;p=linux.git

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 <perfn@axis.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c
index c8a128c9e5e0f..70db7c909f74e 100644
--- 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);