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net: sched: ife: check on metadata length
[ Upstream commit d57493d6d1
]
This patch checks if sk buffer is available to dererence ife header. If
not then NULL will returned to signal an malformed ife packet. This
avoids to crashing the kernel from outside.
Signed-off-by: Alexander Aring <aring@mojatatu.com>
Reviewed-by: Yotam Gigi <yotam.gi@gmail.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -69,6 +69,9 @@ void *ife_decode(struct sk_buff *skb, u16 *metalen)
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int total_pull;
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u16 ifehdrln;
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if (!pskb_may_pull(skb, skb->dev->hard_header_len + IFE_METAHDRLEN))
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return NULL;
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ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
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ifehdrln = ntohs(ifehdr->metalen);
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total_pull = skb->dev->hard_header_len + ifehdrln;
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