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inet: fix IP(V6)_RECVORIGDSTADDR for udp sockets

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Socket cmsg IP(V6)_RECVORIGDSTADDR checks that port range lies within
the packet. For sockets that have transport headers pulled, transport
offset can be negative. Use signed comparison to avoid overflow.

Fixes: e6afc8ace6 ("udp: remove headers from UDP packets before queueing")
Reported-by: Nisar Jagabar <[email protected]>
Signed-off-by: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Willem de Bruijn 2016-12-22 18:19:16 -05:00 • committed by David S. Miller
commit 39b2dd765e
2 changed files with 2 additions and 2 deletions
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2
net/ipv4/ip_sockglue.c
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@ -148,7 +148,7 @@ static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
const struct iphdr *iph = ip_hdr(skb);
__be16 *ports = (__be16 *)skb_transport_header(skb);
if (skb_transport_offset(skb) + 4 > skb->len)
if (skb_transport_offset(skb) + 4 > (int)skb->len)
return;
/* All current transport protocols have the port numbers in the