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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().

Addresses Coverity #115679

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
This commit is contained in:
Guenter Roeck 2012-07-21 10:53:48 +10:00 committed by Zhang Rui
parent f4a821ce6e
commit 79a49168b5
1 changed files with 3 additions and 2 deletions
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5
drivers/thermal/thermal_sys.c
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@ -598,7 +598,7 @@ 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;
@ -611,7 +611,8 @@ 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;