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