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fcoe: make sure fcoe frames are unshared prior to manipulating them

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Based on my last patch I noticed that fcoe_rcv has a simmilar problem, in that
it manipulates the passed in skb without checking to see if it has other users.
Making manipulations to a shared skb can result in various corruptions.

Easy fix, just make sure the skb is unshared prior to doing anything with it.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
This commit is contained in:
Neil Horman 2013-08-03 10:45:54 +00:00 committed by Robert Love
parent c0866286f1
commit 8b61243452
1 changed files with 6 additions and 0 deletions
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6
drivers/scsi/fcoe/fcoe.c
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@ -1452,6 +1452,12 @@ static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
skb_tail_pointer(skb), skb_end_pointer(skb),
skb->csum, skb->dev ? skb->dev->name : "<NULL>");
skb = skb_share_check(skb, GFP_ATOMIC);
if (skb == NULL)
return NET_RX_DROP;
eh = eth_hdr(skb);
if (is_fip_mode(ctlr) &&