[patch 20/20] Fix UDP header pointer after pskb_trim_rcsum()

[Greg KH]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>

[UDP]: Reread uh pointer after pskb_trim

The header may have moved when trimming.

Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/ipv4/udp.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1214,6 +1214,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, 
 
 		if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
 			goto short_packet;
+		uh = skb->h.uh;
 
 		udp4_csum_init(skb, uh);
 

-- 
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