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ch9200: 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: 4a476bd6d1
("usbnet: New driver for QinHeng CH9200 devices")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: James Hughes <james.hughes@raspberrypi.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
d4ca735919
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6bc6895bdd
1 changed files with 2 additions and 7 deletions
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@ -254,14 +254,9 @@ static struct sk_buff *ch9200_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
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tx_overhead = 0x40;
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len = skb->len;
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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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__skb_push(skb, tx_overhead);
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