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smsc75xx: 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: d0cad87170 ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter 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 09:59:21 -07:00 committed by David S. Miller
parent 95b9b88d2d
commit b7c6d26758
1 changed files with 2 additions and 6 deletions
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8
drivers/net/usb/smsc75xx.c
View file

@ -2203,13 +2203,9 @@ static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev,
{
u32 tx_cmd_a, tx_cmd_b;
if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) {
struct sk_buff *skb2 =
skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {
dev_kfree_skb_any(skb);
skb = skb2;
if (!skb)
return NULL;
return NULL;
}
tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;