From 6154aa2ab2e0c81575a844173b19eeaaed551d23 Mon Sep 17 00:00:00 2001
From: Yuanzheng Song <songyuanzheng@huawei.com>
Date: Fri, 15 Oct 2021 08:32:30 +0000
Subject: [PATCH] thermal/core: Fix null pointer dereference in thermal_release()
Git-commit: 1dd7128b839f631b31a9e9dce3aaf639bef74e9d
Patch-mainline: v5.16-rc1
References: stable-5.14.19

[ Upstream commit 1dd7128b839f631b31a9e9dce3aaf639bef74e9d ]

If both dev_set_name() and device_register() failed, then null pointer
dereference occurs in thermal_release() which will use strncmp() to
compare the name.

So fix it by adding dev_set_name() return value check.

Signed-off-by: Yuanzheng Song <songyuanzheng@huawei.com>
Link: https://lore.kernel.org/r/20211015083230.67658-1-songyuanzheng@huawei.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/thermal/thermal_core.c |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -902,6 +902,10 @@ __thermal_cooling_device_register(struct
 		goto out_kfree_cdev;
 	cdev->id = ret;
 
+	ret = dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
+	if (ret)
+		goto out_ida_remove;
+
 	cdev->type = kstrdup(type ? type : "", GFP_KERNEL);
 	if (!cdev->type) {
 		ret = -ENOMEM;
@@ -916,7 +920,6 @@ __thermal_cooling_device_register(struct
 	cdev->device.class = &thermal_class;
 	cdev->devdata = devdata;
 	thermal_cooling_device_setup_sysfs(cdev);
-	dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
 	ret = device_register(&cdev->device);
 	if (ret)
 		goto out_kfree_type;
@@ -1227,6 +1230,10 @@ thermal_zone_device_register(const char
 	tz->id = id;
 	strlcpy(tz->type, type, sizeof(tz->type));
 
+	result = dev_set_name(&tz->device, "thermal_zone%d", tz->id);
+	if (result)
+		goto remove_id;
+
 	if (!ops->critical)
 		ops->critical = thermal_zone_device_critical;
 
@@ -1248,7 +1255,6 @@ thermal_zone_device_register(const char
 	/* A new thermal zone needs to be updated anyway. */
 	atomic_set(&tz->need_update, 1);
 
-	dev_set_name(&tz->device, "thermal_zone%d", tz->id);
 	result = device_register(&tz->device);
 	if (result)
 		goto release_device;