From: Per Forlin <per.forlin@axis.com>
Date: Thu, 13 Feb 2020 15:37:09 +0100
Subject: net: dsa: tag_qca: Make sure there is headroom for tag
Git-commit: 04fb91243a853dbde216d829c79d9632e52aa8d9
Patch-mainline: 5.6-rc2
References: networking-stable-20_02_19

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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 net/dsa/tag_qca.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/dsa/tag_qca.c
+++ b/net/dsa/tag_qca.c
@@ -41,7 +41,7 @@ static struct sk_buff *qca_tag_xmit(stru
 	struct dsa_slave_priv *p = netdev_priv(dev);
 	u16 *phdr, hdr;
 
-	if (skb_cow_head(skb, 0) < 0)
+	if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
 		goto out_free;
 
 	skb_push(skb, QCA_HDR_LEN);