net: dsa: tag_qca: Make sure there is headroom for tag
[ Upstream commit 04fb91243a
]
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -33,7 +33,7 @@ static struct sk_buff *qca_tag_xmit(struct sk_buff *skb, struct net_device *dev)
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struct dsa_port *dp = dsa_slave_to_port(dev);
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u16 *phdr, hdr;
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if (skb_cow_head(skb, 0) < 0)
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if (skb_cow_head(skb, QCA_HDR_LEN) < 0)
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return NULL;
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skb_push(skb, QCA_HDR_LEN);
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