linux-kernel - [PATCH v2] thermal: thermal_of: fix error return code of thermal_of_populate_bind

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Date:   Wed, 10 Mar 2021 04:24:23 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     rui.zhang@...el.com, daniel.lezcano@...aro.org, amitk@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH v2] thermal: thermal_of: fix error return code of thermal_of_populate_bind_params()

When kcalloc() returns NULL to __tcbp or of_count_phandle_with_args() 
returns zero or -ENOENT to count, no error return code of
thermal_of_populate_bind_params() is assigned.
To fix these bugs, ret is assigned with -ENOMEM and -ENOENT in these
cases, respectively.

Fixes: a92bab8919e3 ("of: thermal: Allow multiple devices to share cooling map")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
v2:
* Add the fixing about of_count_phandle_with_args() and the fixes tag.
  Thank Daniel Lezcano for good advice.

---
 drivers/thermal/thermal_of.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 69ef12f852b7..5b76f9a1280d 100644
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -704,14 +704,17 @@ static int thermal_of_populate_bind_params(struct device_node *np,
 
 	count = of_count_phandle_with_args(np, "cooling-device",
 					   "#cooling-cells");
-	if (!count) {
+	if (count <= 0) {
 		pr_err("Add a cooling_device property with at least one device\n");
+		ret = -ENOENT;
 		goto end;
 	}
 
 	__tcbp = kcalloc(count, sizeof(*__tcbp), GFP_KERNEL);
-	if (!__tcbp)
+	if (!__tcbp) {
+		ret = -ENOMEM;
 		goto end;
+	}
 
 	for (i = 0; i < count; i++) {
 		ret = of_parse_phandle_with_args(np, "cooling-device",
-- 
2.17.1