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authorThierry Reding <treding@nvidia.com>2020-07-24 20:01:05 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2020-07-24 20:11:47 +0300
commit82aa68afa16819d9f05b899a5fcf174c2f1fb889 (patch)
tree93dbb8f1be035c43f9d20a28a668649028d43afe /drivers/thermal
parent287d959558357e155c889bc35579eb35691a8fcb (diff)
downloadlinux-82aa68afa16819d9f05b899a5fcf174c2f1fb889.tar.xz
thermal: core: Fix thermal zone lookup by ID
When a thermal zone is looked up by an ID and no zone is found matching that ID, the thermal_zone_get_by_id() function will return a pointer to the thermal zone list head which isn't actually a valid thermal zone. This can lead to a subsequent crash because a valid pointer is returned to the called, but dereferencing that pointer as struct thermal_zone is not safe. Fixes: 329b064fbd13 ("thermal: core: Get thermal zone by id") Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20200724170105.2705467-1-thierry.reding@gmail.com
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/thermal_core.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 007f9618e20a..9748fbb9a3a1 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -751,16 +751,18 @@ int for_each_thermal_zone(int (*cb)(struct thermal_zone_device *, void *),
struct thermal_zone_device *thermal_zone_get_by_id(int id)
{
- struct thermal_zone_device *tz = NULL;
+ struct thermal_zone_device *tz, *match = NULL;
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
- if (tz->id == id)
+ if (tz->id == id) {
+ match = tz;
break;
+ }
}
mutex_unlock(&thermal_list_lock);
- return tz;
+ return match;
}
void thermal_zone_device_unbind_exception(struct thermal_zone_device *tz,