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net: dsa: tag_ar9331: Make sure there is headroom for tag

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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 15:37:10 +01:00 committed by David S. Miller
parent 04fb91243a
commit ddc9abaf5d
1 changed files with 1 additions and 1 deletions
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2
net/dsa/tag_ar9331.c
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@ -31,7 +31,7 @@ static struct sk_buff *ar9331_tag_xmit(struct sk_buff *skb,
__le16 *phdr;
u16 hdr;
if (skb_cow_head(skb, 0) < 0)
if (skb_cow_head(skb, AR9331_HDR_LEN) < 0)
return NULL;
phdr = skb_push(skb, AR9331_HDR_LEN);