Commit 44c4e721 authored by Eric Dumazet's avatar Eric Dumazet Committed by Ben Hutchings

smsc75xx: use skb_cow_head() to deal with cloned skbs

commit b7c6d267 upstream.

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: d0cad871 ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver")
Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Cc: James Hughes <james.hughes@raspberrypi.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent a6dc29a3
...@@ -1170,13 +1170,9 @@ static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev, ...@@ -1170,13 +1170,9 @@ static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev,
{ {
u32 tx_cmd_a, tx_cmd_b; u32 tx_cmd_a, tx_cmd_b;
if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) { if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {
struct sk_buff *skb2 =
skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
dev_kfree_skb_any(skb); dev_kfree_skb_any(skb);
skb = skb2; return NULL;
if (!skb)
return NULL;
} }
tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS; tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;
......
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