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| author | James Hughes <james.hughes@raspberrypi.org> | 2017-04-19 11:13:40 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-20 16:27:15 -0400 |
| commit | e9156cd26a495a18706e796f02a81fee41ec14f4 (patch) | |
| tree | 1611a0f290429a70e0fbbecada5a825f2af0e324 | |
| parent | 74d209b8350a19d4f70252aa7a4e3d0b865676dd (diff) | |
| download | linux-e9156cd26a495a18706e796f02a81fee41ec14f4.tar.gz linux-e9156cd26a495a18706e796f02a81fee41ec14f4.tar.bz2 linux-e9156cd26a495a18706e796f02a81fee41ec14f4.zip | |
smsc95xx: Use skb_cow_head to deal with cloned skbs
The driver was failing to check that the SKB wasn't cloned
before adding checksum data.
Replace existing handling to extend/copy the header buffer
with skb_cow_head.
Signed-off-by: James Hughes <james.hughes@raspberrypi.org>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Woojung Huh <Woojung.Huh@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/usb/smsc95xx.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index 831aa33d078a..5f19fb0f025d 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -2001,13 +2001,13 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev, /* We do not advertise SG, so skbs should be already linearized */ BUG_ON(skb_shinfo(skb)->nr_frags); - if (skb_headroom(skb) < overhead) { - struct sk_buff *skb2 = skb_copy_expand(skb, - overhead, 0, flags); + /* Make writable and expand header space by overhead if required */ + if (skb_cow_head(skb, overhead)) { + /* Must deallocate here as returning NULL to indicate error + * means the skb won't be deallocated in the caller. + */ dev_kfree_skb_any(skb); - skb = skb2; - if (!skb) - return NULL; + return NULL; } if (csum) { |