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Message-Id: <20211119171444.173426536@linuxfoundation.org>
Date: Fri, 19 Nov 2021 18:38:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, David Collins <quic_collinsd@...cinc.com>,
Subbaraman Narayanamurthy <quic_subbaram@...cinc.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.14 14/15] thermal: Fix NULL pointer dereferences in of_thermal_ functions
From: Subbaraman Narayanamurthy <quic_subbaram@...cinc.com>
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@...cinc.com>
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@...cinc.com>
Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/thermal/thermal_of.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -89,7 +89,7 @@ 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);
@@ -186,6 +186,9 @@ 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);
}
@@ -194,7 +197,7 @@ 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);
@@ -301,7 +304,7 @@ 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);
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