[linux,dev-4.13,v3] hwmon (occ): Fix integer overflow in multiplication

Message ID 1513713295-27120-1-git-send-email-eajames@linux.vnet.ibm.com
State New
Headers show
Series
  • [linux,dev-4.13,v3] hwmon (occ): Fix integer overflow in multiplication
Related show

Commit Message

Eddie James Dec. 19, 2017, 7:54 p.m.
Power values were overflowing INT_MAX when being converted to
microwatts, even though the storage was sufficiently large (unsigned 64
bit). Change literals to unsigned long long. Also change temp storage to u32
to avoid overflows at 65000 millidegrees.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
---
 drivers/hwmon/occ/common.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

Patch

diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
index 7c97a4c..d0b2a29 100644
--- a/drivers/hwmon/occ/common.c
+++ b/drivers/hwmon/occ/common.c
@@ -256,7 +256,7 @@  static ssize_t occ_show_temp_1(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	int rc;
-	u16 val = 0;
+	u32 val = 0;
 	struct temp_sensor_1 *temp;
 	struct occ *occ = dev_get_drvdata(dev);
 	struct occ_sensors *sensors = &occ->sensors;
@@ -393,7 +393,7 @@  static ssize_t occ_show_power_1(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	int rc;
-	u32 val = 0;
+	u64 val = 0;
 	struct power_sensor_1 *power;
 	struct occ *occ = dev_get_drvdata(dev);
 	struct occ_sensors *sensors = &occ->sensors;
@@ -417,13 +417,13 @@  static ssize_t occ_show_power_1(struct device *dev,
 		break;
 	case 3:
 		/* microwatts */
-		val = get_unaligned_be16(&power->value) * 1000000;
+		val = get_unaligned_be16(&power->value) * 1000000ULL;
 		break;
 	default:
 		return -EINVAL;
 	}
 
-	return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
+	return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
 }
 
 static ssize_t occ_show_power_2(struct device *dev,
@@ -454,7 +454,7 @@  static ssize_t occ_show_power_2(struct device *dev,
 		break;
 	case 3:
 		/* microwatts */
-		val = get_unaligned_be16(&power->value) * 1000000;
+		val = get_unaligned_be16(&power->value) * 1000000ULL;
 		break;
 	case 4:
 		val = power->function_id;
@@ -496,7 +496,7 @@  static ssize_t occ_show_power_a0(struct device *dev,
 		break;
 	case 3:
 		/* microwatts */
-		val = get_unaligned_be16(&power->system.value) * 1000000;
+		val = get_unaligned_be16(&power->system.value) * 1000000ULL;
 		break;
 	case 4:
 		val = get_unaligned_be32(&power->system.update_tag);
@@ -511,7 +511,7 @@  static ssize_t occ_show_power_a0(struct device *dev,
 		break;
 	case 8:
 		/* microwatts */
-		val = get_unaligned_be16(&power->proc.value) * 1000000;
+		val = get_unaligned_be16(&power->proc.value) * 1000000ULL;
 		break;
 	case 9:
 		val = get_unaligned_be32(&power->proc.update_tag);
@@ -523,7 +523,7 @@  static ssize_t occ_show_power_a0(struct device *dev,
 		return snprintf(buf, PAGE_SIZE - 1, "vdd\n");
 	case 12:
 		/* microwatts */
-		val = get_unaligned_be16(&power->vdd.value) * 1000000;
+		val = get_unaligned_be16(&power->vdd.value) * 1000000ULL;
 		break;
 	case 13:
 		val = get_unaligned_be32(&power->vdd.update_tag);
@@ -535,7 +535,7 @@  static ssize_t occ_show_power_a0(struct device *dev,
 		return snprintf(buf, PAGE_SIZE - 1, "vdn\n");
 	case 16:
 		/* microwatts */
-		val = get_unaligned_be16(&power->vdn.value) * 1000000;
+		val = get_unaligned_be16(&power->vdn.value) * 1000000ULL;
 		break;
 	case 17:
 		val = get_unaligned_be32(&power->vdn.update_tag);