This is a note to let you know that I've just added the patch titled
thermal: Fix NULL pointer dereferences in of_thermal_ functions
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
thermal-fix-null-pointer-dereferences-in-of_thermal_-functions.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 96cfe05051fd8543cdedd6807ec59a0e6c409195 Mon Sep 17 00:00:00 2001
From: Subbaraman Narayanamurthy <quic_subbaram@xxxxxxxxxxx>
Date: Thu, 4 Nov 2021 16:57:07 -0700
Subject: thermal: Fix NULL pointer dereferences in of_thermal_ functions
From: Subbaraman Narayanamurthy <quic_subbaram@xxxxxxxxxxx>
commit 96cfe05051fd8543cdedd6807ec59a0e6c409195 upstream.
of_parse_thermal_zones() parses the thermal-zones node and registers a
thermal_zone device for each subnode. However, if a thermal zone is
consuming a thermal sensor and that thermal sensor device hasn't probed
yet, an attempt to set trip_point_*_temp for that thermal zone device
can cause a NULL pointer dereference. Fix it.
console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp
...
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020
...
Call trace:
of_thermal_set_trip_temp+0x40/0xc4
trip_point_temp_store+0xc0/0x1dc
dev_attr_store+0x38/0x88
sysfs_kf_write+0x64/0xc0
kernfs_fop_write_iter+0x108/0x1d0
vfs_write+0x2f4/0x368
ksys_write+0x7c/0xec
__arm64_sys_write+0x20/0x30
el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc
do_el0_svc+0x28/0xa0
el0_svc+0x14/0x24
el0_sync_handler+0x88/0xec
el0_sync+0x1c0/0x200
While at it, fix the possible NULL pointer dereference in other
functions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(),
of_thermal_get_trend().
Suggested-by: David Collins <quic_collinsd@xxxxxxxxxxx>
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@xxxxxxxxxxx>
Acked-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Mark-PK Tsai <mark-pk.tsai@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/thermal/of-thermal.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -91,7 +91,7 @@ static int of_thermal_get_temp(struct th
{
struct __thermal_zone *data = tz->devdata;
- if (!data->ops->get_temp)
+ if (!data->ops || !data->ops->get_temp)
return -EINVAL;
return data->ops->get_temp(data->sensor_data, temp);
@@ -188,6 +188,9 @@ static int of_thermal_set_emul_temp(stru
{
struct __thermal_zone *data = tz->devdata;
+ if (!data->ops || !data->ops->set_emul_temp)
+ return -EINVAL;
+
return data->ops->set_emul_temp(data->sensor_data, temp);
}
@@ -196,7 +199,7 @@ static int of_thermal_get_trend(struct t
{
struct __thermal_zone *data = tz->devdata;
- if (!data->ops->get_trend)
+ if (!data->ops || !data->ops->get_trend)
return -EINVAL;
return data->ops->get_trend(data->sensor_data, trip, trend);
@@ -336,7 +339,7 @@ static int of_thermal_set_trip_temp(stru
if (trip >= data->ntrips || trip < 0)
return -EDOM;
- if (data->ops->set_trip_temp) {
+ if (data->ops && data->ops->set_trip_temp) {
int ret;
ret = data->ops->set_trip_temp(data->sensor_data, trip, temp);
Patches currently in stable-queue which might be from quic_subbaram@xxxxxxxxxxx are
queue-5.4/thermal-fix-null-pointer-dereferences-in-of_thermal_-functions.patch
