From: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
To: <subbaram@quicinc.com>
Cc: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>,
<stable@vger.kernel.org>
Subject: [PATCH] thermal: Fix a NULL pointer dereference
Date: Fri, 3 Sep 2021 17:31:26 -0700 [thread overview]
Message-ID: <1630715486-4880-1-git-send-email-quic_subbaram@quicinc.com> (raw)
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
Cc: stable@vger.kernel.org
Suggested-by: David Collins <quic_collinsd@quicinc.com>
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
---
drivers/thermal/thermal_of.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 6379f26..ba53252 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -301,7 +301,7 @@ static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip,
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);
--
2.7.4
next reply other threads:[~2021-09-04 0:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-04 0:31 Subbaraman Narayanamurthy [this message]
2021-09-04 0:34 [PATCH] thermal: Fix a NULL pointer dereference Subbaraman Narayanamurthy
2021-09-04 1:07 ` David Collins
2021-09-07 18:32 ` Subbaraman Narayanamurthy
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