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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>
This commit is contained in:
Per Forlin 2020-02-13 15:37:09 +01:00 committed by David S. Miller
parent 5fdcce211b
commit 04fb91243a
1 changed files with 1 additions and 1 deletions
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net/dsa/tag_qca.c
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@ -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); struct dsa_port *dp = dsa_slave_to_port(dev);
u16 *phdr, hdr; u16 *phdr, hdr;
if (skb_cow_head(skb, 0) < 0) if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
return NULL; return NULL;
skb_push(skb, QCA_HDR_LEN); skb_push(skb, QCA_HDR_LEN);