linux-kernel - [PATCH] hwmon: (applesmc) Limit key length in warning messages

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Message-Id: <1339059269-383-1-git-send-email-rydberg@euromail.se>
Date:	Thu,  7 Jun 2012 10:54:29 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Guenter Roeck <guenter.roeck@...csson.com>
Cc:	Jean Delvare <khali@...ux-fr.org>, lm-sensors@...sensors.org,
	linux-kernel@...r.kernel.org, Henrik Rydberg <rydberg@...omail.se>
Subject: [PATCH] hwmon: (applesmc) Limit key length in warning messages

Key lookups may call read_smc() with a fixed-length key string,
and if the lookup fails, trailing stack content may appear in the
kernel log. Fixed with this patch.

Signed-off-by: Henrik Rydberg <rydberg@...omail.se>
---
 drivers/hwmon/applesmc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c
index f082e48..70d62f5 100644
--- a/drivers/hwmon/applesmc.c
+++ b/drivers/hwmon/applesmc.c
@@ -215,7 +215,7 @@ static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 	int i;
 
 	if (send_command(cmd) || send_argument(key)) {
-		pr_warn("%s: read arg fail\n", key);
+		pr_warn("%.4s: read arg fail\n", key);
 		return -EIO;
 	}
 
@@ -223,7 +223,7 @@ static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 
 	for (i = 0; i < len; i++) {
 		if (__wait_status(0x05)) {
-			pr_warn("%s: read data fail\n", key);
+			pr_warn("%.4s: read data fail\n", key);
 			return -EIO;
 		}
 		buffer[i] = inb(APPLESMC_DATA_PORT);
-- 
1.7.10.3

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