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@tsinghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210310122423.3266-1-baijiaju1990@gmail.com

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index 69ef12f..5b76f9a 100644 (file)
--- 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",