linux-kernel - [PATCH 02/12] NetLabel: convert a BUG_ON in the CIPSO code to a runtime check

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Message-ID: <Line.LNX.4.64.0704260203430.30059@d.namei>
Date:	Thu, 26 Apr 2007 02:04:17 -0400 (EDT)
From:	James Morris <jmorris@...ei.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	linux-kernel@...r.kernel.org, Stephen Smalley <sds@...ho.nsa.gov>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 02/12] NetLabel: convert a BUG_ON in the CIPSO code to a
 runtime check

From: Paul Moore <paul.moore@...com>

This patch changes a BUG_ON in the CIPSO code to a runtime check.  It should
also increase the readability of the code as it replaces an unexplained
constant with a well defined macro.

Signed-off-by: Paul Moore <paul.moore@...com>
Signed-off-by: James Morris <jmorris@...ei.org>
---
 net/ipv4/cipso_ipv4.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index d466bd5..6afc398 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -1142,7 +1142,9 @@ static int cipso_v4_map_cat_rng_hton(const struct cipso_v4_doi *doi_def,
 	u32 cat_size = 0;
 
 	/* make sure we don't overflow the 'array[]' variable */
-	BUG_ON(net_cat_len > 30);
+	if (net_cat_len >
+	    (CIPSO_V4_OPT_LEN_MAX - CIPSO_V4_HDR_LEN - CIPSO_V4_TAG_RNG_BLEN))
+		return -ENOSPC;
 
 	for (;;) {
 		iter = netlbl_secattr_catmap_walk(secattr->mls_cat, iter + 1);
-- 
1.5.0.6

-
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