diff options
| author |   Eric Dumazet <edumazet@google.com> | 2017-04-19 09:59:21 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-04-21 13:24:04 -0400 |
| commit | b7c6d2675899cfff0180412c63fc9cbd5bacdb4d (patch) | |
| tree | 8c3d8abb51f9a938a28f781bcbe4621be0ebf567 /drivers | |
| parent | ipv6: sr: fix double free of skb after handling invalid SRH (diff) | |
| download | linux-dev-b7c6d2675899cfff0180412c63fc9cbd5bacdb4d.tar.xz linux-dev-b7c6d2675899cfff0180412c63fc9cbd5bacdb4d.zip | |
smsc75xx: 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: d0cad871703b ("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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/usb/smsc75xx.c | 8 |
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c index 0b17b40d7a4f..190de9a90f73 100644 --- a/drivers/net/usb/smsc75xx.c +++ b/drivers/net/usb/smsc75xx.c @@ -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; |