netdev - [PATCH] Check the value of doi before referencing it

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Message-Id: <1305692980-4730-1-git-send-email-huzaifas@redhat.com>
Date:	Wed, 18 May 2011 09:59:40 +0530
From:	Huzaifa Sidhpurwala <huzaifas@...hat.com>
To:	netdev@...r.kernel.org
Cc:	kaber@...sh.net, yoshfuji@...ux-ipv6.org, jmorris@...ei.org,
	pekkas@...core.fi, kuznet@....inr.ac.ru, davem@...emloft.net,
	Huzaifa Sidhpurwala <huzaifas@...hat.com>
Subject: [PATCH] Check the value of doi before referencing it

Value of doi is not checked before referencing it.
Though this does not cause any null pointer dereference since
all the callers of cipso_v4_doi_add check the value of doi
before calling the function, but it would be a good programming
practice to do so anyways :)

Signed-off-by: Huzaifa Sidhpurwala <huzaifas@...hat.com>
---
 net/ipv4/cipso_ipv4.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/cipso_ipv4.c b/net/ipv4/cipso_ipv4.c
index a0af7ea..7adc4ea 100644
--- a/net/ipv4/cipso_ipv4.c
+++ b/net/ipv4/cipso_ipv4.c
@@ -473,10 +473,13 @@ int cipso_v4_doi_add(struct cipso_v4_doi *doi_def,
 	u32 doi_type;
 	struct audit_buffer *audit_buf;
 
-	doi = doi_def->doi;
-	doi_type = doi_def->type;
+	if (doi_def) {
+		doi = doi_def->doi;
+		doi_type = doi_def->type;
+	} else
+	goto doi_add_return;
 
-	if (doi_def == NULL || doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
+	if (doi_def->doi == CIPSO_V4_DOI_UNKNOWN)
 		goto doi_add_return;
 	for (iter = 0; iter < CIPSO_V4_TAG_MAXCNT; iter++) {
 		switch (doi_def->tags[iter]) {
-- 
1.7.1

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