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cx82310_eth: use skb_cow_head() to deal with cloned skbs

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We need to ensure there is enough headroom to push extra header,
but we also need to check if we are allowed to change headers.

skb_cow_head() is the proper helper to deal with this.

Fixes: cc28a20e77 ("introduce cx82310_eth: Conexant CX82310-based ADSL router USB ethernet driver")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Hughes <james.hughes@raspberrypi.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2017-04-19 09:59:22 -07:00 committed by David S. Miller
parent b7c6d26758
commit a9e840a208
1 changed files with 2 additions and 5 deletions
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5
drivers/net/usb/cx82310_eth.c
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@ -293,11 +293,8 @@ static struct sk_buff *cx82310_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
{
int len = skb->len;
if (skb_headroom(skb) < 2) {
struct sk_buff *skb2 = skb_copy_expand(skb, 2, 0, flags);
if (skb_cow_head(skb, 2)) {
dev_kfree_skb_any(skb);
skb = skb2;
if (!skb)
return NULL;
}
skb_push(skb, 2);