linux-kernel - [PATCH v1 4/4] target: check hex2bin result

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Date:	Tue, 20 Sep 2011 15:52:53 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	Arnaud Lacombe <lacombar@...il.com>,
	James Morris <jmorris@...ei.org>,
	David Safford <safford@...son.ibm.com>
Subject: [PATCH v1 4/4] target: check hex2bin result

Now that hex2bin does error checking, on error add debugging error msg.

Changelog v1:
- hex2bin now returns an int

Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
---
 drivers/target/target_core_fabric_lib.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_fabric_lib.c b/drivers/target/target_core_fabric_lib.c
index c4ea3a9..17658ca 100644
--- a/drivers/target/target_core_fabric_lib.c
+++ b/drivers/target/target_core_fabric_lib.c
@@ -63,6 +63,7 @@ u32 sas_get_pr_transport_id(
 	unsigned char *buf)
 {
 	unsigned char *ptr;
+	bool ret;
 
 	/*
 	 * Set PROTOCOL IDENTIFIER to 6h for SAS
@@ -74,7 +75,9 @@ u32 sas_get_pr_transport_id(
 	 */
 	ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
 
-	hex2bin(&buf[4], ptr, 8);
+	ret = hex2bin(&buf[4], ptr, 8);
+	if (ret < 0)
+		pr_debug("sas transport_id: invalid hex string\n");
 
 	/*
 	 * The SAS Transport ID is a hardcoded 24-byte length
@@ -158,6 +161,8 @@ u32 fc_get_pr_transport_id(
 	unsigned char *ptr;
 	int i;
 	u32 off = 8;
+	bool ret;
+
 	/*
 	 * PROTOCOL IDENTIFIER is 0h for FCP-2
 	 *
@@ -174,7 +179,9 @@ u32 fc_get_pr_transport_id(
 			i++;
 			continue;
 		}
-		hex2bin(&buf[off++], &ptr[i], 1);
+		ret = hex2bin(&buf[off++], &ptr[i], 1);
+		if (ret < 0)
+			pr_debug("fc transport_id: invalid hex string\n");
 		i += 2;
 	}
 	/*
-- 
1.7.3.4

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