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net: pktgen: fix null ptr deref in skb allocation

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[ Upstream commit 3de03596df ]

Fix possible null pointer dereference that may occur when calling
skb_reserve() on a null skb.

Fixes: 879c7220e8 ("net: pktgen: Observe needed_headroom of the device")
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Fastabend
2016-01-10 21:38:44 -08:00
committed by Greg Kroah-Hartman
parent 8ece807074
commit 4d90b0d1c1
1 changed files with 3 additions and 1 deletions
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net/core/pktgen.c
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@@ -2787,6 +2787,8 @@ static struct sk_buff *pktgen_alloc_skb(struct net_device *dev,
} else { } else {
skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT); skb = __netdev_alloc_skb(dev, size, GFP_NOWAIT);
} }
if (likely(skb))
skb_reserve(skb, LL_RESERVED_SPACE(dev)); skb_reserve(skb, LL_RESERVED_SPACE(dev));
return skb; return skb;