linux-kernel - [PATCH] s390: net: claw.c: Fix a define larger than in a sizeof in conjunction with strncpy

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Message-Id: <1406461822-11249-2-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Sun, 27 Jul 2014 13:50:22 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] s390: net: claw.c:  Fix a define larger than in a sizeof in conjunction with strncpy

The MAX_NAME_LEN is larger than sizeof, which could potentially
giving lots of error here.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/s390/net/claw.c |   31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/drivers/s390/net/claw.c b/drivers/s390/net/claw.c
index d837c3c..0172ce8 100644
--- a/drivers/s390/net/claw.c
+++ b/drivers/s390/net/claw.c
@@ -3068,12 +3068,15 @@ claw_hname_write(struct device *dev, struct device_attribute *attr,
 	if (!priv)
 		return -ENODEV;
 	p_env = priv->p_env;
-	if (count > MAX_NAME_LEN+1)
+	if (count >= sizeof(p_env->host_name) && count > 0)
 		return -EINVAL;
-	memset(p_env->host_name, 0x20, MAX_NAME_LEN);
+
 	strncpy(p_env->host_name,buf, count);
-	p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
-	p_env->host_name[MAX_NAME_LEN] = 0x00;
+	/* clear extra 0x0a */
+	memset(&p_env->host_name[count - 1],
+			' ', sizeof(p_env->host_name) - count);
+	p_env->host_name[sizeof(p_env->host_name) - 1] = '\0';
+
 	CLAW_DBF_TEXT(2, setup, "HstnSet");
 	CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
 
@@ -3106,12 +3109,14 @@ claw_adname_write(struct device *dev, struct device_attribute *attr,
 	if (!priv)
 		return -ENODEV;
 	p_env = priv->p_env;
-	if (count > MAX_NAME_LEN+1)
+	if (count >= sizeof(p_env->adapter_name) && count > 0)
 		return -EINVAL;
-	memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
+
 	strncpy(p_env->adapter_name,buf, count);
-	p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
-	p_env->adapter_name[MAX_NAME_LEN] = 0x00;
+	/* clear extra 0x0a */
+	memset(&p_env->adapter_name[count - 1],
+			' ', sizeof(p_env->adapter_name) - count);
+	p_env->adapter_name[sizeof(p_env->adapter_name) - 1] = '\0';
 	CLAW_DBF_TEXT(2, setup, "AdnSet");
 	CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
 
@@ -3145,12 +3150,14 @@ claw_apname_write(struct device *dev, struct device_attribute *attr,
 	if (!priv)
 		return -ENODEV;
 	p_env = priv->p_env;
-	if (count > MAX_NAME_LEN+1)
+	if (count >= sizeof(p_env->api_type) && count > 0)
 		return -EINVAL;
-	memset(p_env->api_type, 0x20, MAX_NAME_LEN);
+
 	strncpy(p_env->api_type,buf, count);
-	p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
-	p_env->api_type[MAX_NAME_LEN] = 0x00;
+	/* we get a loose 0x0a */
+	memset(&p_env->api_type[count - 1],
+			' ', sizeof(p_env->api_type) - count);
+	p_env->api_type[sizeof(p_env->api_type) - 1] = '\0';
 	if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 		p_env->read_size=DEF_PACK_BUFSIZE;
 		p_env->write_size=DEF_PACK_BUFSIZE;
-- 
1.7.10.4

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