linux-kernel - [PATCH] thermal: Fix potential out-of-bounds memory access

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Date:	Wed, 20 Jun 2012 07:36:34 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	linux-kernel@...r.kernel.org
Cc:	Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] thermal: Fix potential out-of-bounds memory access

temp_crit.name and temp_input.name have a length of 16 bytes. Using
THERMAL_NAME_LENGTH (20) as length parameter for snprintf() may result
in out-of-bounds memory accesses. Replace it with sizeof().

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
Coverity #115679

 drivers/thermal/thermal_sys.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 9f2a35c..d9a682e 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -549,7 +549,7 @@ thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 	temp->tz = tz;
 	hwmon->count++;
 
-	snprintf(temp->temp_input.name, THERMAL_NAME_LENGTH,
+	snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
 		 "temp%d_input", hwmon->count);
 	temp->temp_input.attr.attr.name = temp->temp_input.name;
 	temp->temp_input.attr.attr.mode = 0444;
@@ -562,7 +562,8 @@ thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 	if (tz->ops->get_crit_temp) {
 		unsigned long temperature;
 		if (!tz->ops->get_crit_temp(tz, &temperature)) {
-			snprintf(temp->temp_crit.name, THERMAL_NAME_LENGTH,
+			snprintf(temp->temp_crit.name,
+				 sizeof(temp->temp_crit.name),
 				"temp%d_crit", hwmon->count);
 			temp->temp_crit.attr.attr.name = temp->temp_crit.name;
 			temp->temp_crit.attr.attr.mode = 0444;
-- 
1.7.9.7

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