From: Paul Moore <paul.moore@hp.com>
Date: Fri, 17 Nov 2006 22:38:47 +0000 (-0500)
Subject: NetLabel: check for a CIPSOv4 option before we do call into the CIPSOv4 layer
X-Git-Tag: v2.6.20-rc1~34^2~40^2~279
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05e00cbf5036929355020dab4837b637203a0742;p=linux-2.6

NetLabel: check for a CIPSOv4 option before we do call into the CIPSOv4 layer

Right now the NetLabel code always jumps into the CIPSOv4 layer to determine if
a CIPSO IP option is present.  However, we can do this check directly in the
NetLabel code by making use of the CIPSO_V4_OPTEXIST() macro which should save
us a function call in the common case of not having a CIPSOv4 option present.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
---

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index f0a0785047..fb5d913f58 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1435,8 +1435,6 @@ int cipso_v4_skbuff_getattr(const struct sk_buff *skb,
 	u32 doi;
 	struct cipso_v4_doi *doi_def;
 
-	if (!CIPSO_V4_OPTEXIST(skb))
-		return -ENOMSG;
 	cipso_ptr = CIPSO_V4_OPTPTR(skb);
 	if (cipso_v4_cache_check(cipso_ptr, cipso_ptr[1], secattr) == 0)
 		return 0;
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index da2f1975a0..b35ebf9491 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -149,10 +149,8 @@ int netlbl_socket_getattr(const struct socket *sock,
 int netlbl_skbuff_getattr(const struct sk_buff *skb,
 			  struct netlbl_lsm_secattr *secattr)
 {
-	int ret_val;
-
-	ret_val = cipso_v4_skbuff_getattr(skb, secattr);
-	if (ret_val == 0)
+	if (CIPSO_V4_OPTEXIST(skb) &&
+	    cipso_v4_skbuff_getattr(skb, secattr) == 0)
 		return 0;
 
 	return netlbl_unlabel_getattr(secattr);