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net: sched: ife: check on metadata length

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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 <[email protected]>
Reviewed-by: Yotam Gigi <[email protected]>
Acked-by: Jamal Hadi Salim <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Alexander Aring authored and David S. Miller committed 2018-04-22 21:12:00 -04:00
1 parent cc74eddd0f
commit d57493d6d1
1 file changed
+3
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net/ife/ife.c
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@@ -69,6 +69,9 @@ void *ife_decode(struct sk_buff *skb, u16 *metalen)
int total_pull;
u16 ifehdrln;
if (!pskb_may_pull(skb, skb->dev->hard_header_len + IFE_METAHDRLEN))
return NULL;
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
ifehdrln = ntohs(ifehdr->metalen);
total_pull = skb->dev->hard_header_len + ifehdrln;