From: Per Forlin <per.forlin@axis.com> [ Upstream commit 04fb91243a853dbde216d829c79d9632e52aa8d9 ] 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> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- net/dsa/tag_qca.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/dsa/tag_qca.c b/net/dsa/tag_qca.c index 66a9521..9c0dd31 100644 --- a/net/dsa/tag_qca.c +++ b/net/dsa/tag_qca.c @@ -41,7 +41,7 @@ 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); -- 1.8.3