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lan78xx: use skb_cow_head() to deal with cloned skbs
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: 55d7de9de6
("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Hughes <james.hughes@raspberrypi.org>
Cc: Woojung Huh <woojung.huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
d532c1082f
commit
d4ca735919
1 changed files with 2 additions and 7 deletions
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@ -2607,14 +2607,9 @@ static struct sk_buff *lan78xx_tx_prep(struct lan78xx_net *dev,
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{
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u32 tx_cmd_a, tx_cmd_b;
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if (skb_headroom(skb) < TX_OVERHEAD) {
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struct sk_buff *skb2;
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skb2 = skb_copy_expand(skb, TX_OVERHEAD, 0, flags);
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if (skb_cow_head(skb, TX_OVERHEAD)) {
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dev_kfree_skb_any(skb);
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skb = skb2;
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if (!skb)
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return NULL;
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return NULL;
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}
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if (lan78xx_linearize(skb) < 0)
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