[09/13] [XFRM]: Fix possible overflow of sock->sk_policy

[Chris Wright <chrisw@osdl.org>]

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

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

From: Herbert Xu <herbert@gondor.apana.org.au>

[XFRM]: Fix possible overflow of sock->sk_policy

Spotted by, and original patch by, Balazs Scheidler.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 net/xfrm/xfrm_user.c |    3 +++
 1 files changed, 3 insertions(+)

--- linux-2.6.12.3.orig/net/xfrm/xfrm_user.c	2005-07-28 11:17:01.000000000 -0700
+++ linux-2.6.12.3/net/xfrm/xfrm_user.c	2005-07-28 11:17:18.000000000 -0700
@@ -1180,6 +1180,9 @@
 	if (nr > XFRM_MAX_DEPTH)
 		return NULL;
 
+	if (p->dir > XFRM_POLICY_OUT)
+		return NULL;
+
 	xp = xfrm_policy_alloc(GFP_KERNEL);
 	if (xp == NULL) {
 		*dir = -ENOBUFS;
-
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