[patch 62/71] ipv4: make ip_append_data() handle NULL routing table

[Greg KH]

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

------------------
From: Julien TINNES <julien@xxxxxxx>

commit 788d908f2879a17e5f80924f3da2e23f1034482d upstream.

Add a check in ip_append_data() for NULL *rtp to prevent future bugs in
callers from being exploitable.

Signed-off-by: Julien Tinnes <julien@xxxxxxx>
Signed-off-by: Tavis Ormandy <taviso@xxxxxxxxxxxxxxxx>
Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/ipv4/ip_output.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -814,6 +814,8 @@ int ip_append_data(struct sock *sk,
 			inet->cork.addr = ipc->addr;
 		}
 		rt = *rtp;
+		if (unlikely(!rt))
+			return -EFAULT;
 		/*
 		 * We steal reference to this route, caller should not release it
 		 */


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