Kernel/linux-next
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git synced 2025-01-17 13:58:46 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

thermal: core: Fix thermal zone lookup by ID

Browse Source 
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
This commit is contained in:
Thierry Reding 2020-07-24 19:01:05 +02:00 committed by Daniel Lezcano
parent 287d959558
commit 82aa68afa1
1 changed files with 5 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/thermal/thermal_core.c
View File

@ -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,