Commit 6bc6895b authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: 4a476bd6

 ("usbnet: New driver for QinHeng CH9200 devices")
Signed-off-by: default avatarEric Dumazet <>
Cc: James Hughes <>
Cc: Matthew Garrett <>
Signed-off-by: default avatarDavid S. Miller <>
parent d4ca7359
......@@ -254,14 +254,9 @@ static struct sk_buff *ch9200_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
tx_overhead = 0x40;
len = skb->len;
if (skb_headroom(skb) < tx_overhead) {
struct sk_buff *skb2;
skb2 = skb_copy_expand(skb, tx_overhead, 0, flags);
if (skb_cow_head(skb, tx_overhead)) {
skb = skb2;
if (!skb)
return NULL;
return NULL;
__skb_push(skb, tx_overhead);
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