linux-kernel - [PATCH 3.2 018/131] hwmon: (smsc47m192) Fix temperature limit and vrm write operations

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 11 Sep 2014 13:32:13 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Guenter Roeck" <linux@...ck-us.net>,
	"Axel Lin" <axel.lin@...ics.com>, "Jean Delvare" <jdelvare@...e.de>
Subject: [PATCH 3.2 018/131] hwmon: (smsc47m192) Fix temperature limit and
 vrm write operations

3.2.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit 043572d5444116b9d9ad8ae763cf069e7accbc30 upstream.

Temperature limit clamps are applied after converting the temperature
from milli-degrees C to degrees C, so either the clamp limit needs
to be specified in degrees C, not milli-degrees C, or clamping must
happen before converting to degrees C. Use the latter method to avoid
overflows.

vrm is an u8, so the written value needs to be limited to [0, 255].

Cc: Axel Lin <axel.lin@...ics.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Jean Delvare <jdelvare@...e.de>
[bwh: Backported to 3.2:
 - Driver is not using clamp_val(); keep using SENSORS_LIMIT() for consistency
 - Driver is not using kstrtoul(); make the minimum change to set_vrm() so
   we can validate the value before assigning]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hwmon/smsc47m192.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/hwmon/smsc47m192.c
+++ b/drivers/hwmon/smsc47m192.c
@@ -84,7 +84,7 @@ static inline u8 IN_TO_REG(unsigned long
    REG: 1C/bit, two's complement */
 static inline s8 TEMP_TO_REG(int val)
 {
-	return SENSORS_LIMIT(SCALE(val, 1, 1000), -128000, 127000);
+	return SCALE(SENSORS_LIMIT(val, -128000, 127000), 1, 1000);
 }
 
 static inline int TEMP_FROM_REG(s8 val)
@@ -349,7 +349,13 @@ static ssize_t set_vrm(struct device *de
 		const char *buf, size_t count)
 {
 	struct smsc47m192_data *data = dev_get_drvdata(dev);
-	data->vrm = simple_strtoul(buf, NULL, 10);
+	unsigned long val;
+
+	val = simple_strtoul(buf, NULL, 10);
+	if (val > 255)
+		return -EINVAL;
+ 
+	data->vrm = val;
 	return count;
 }
 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/