[PATCH 5.4 275/408] watchdog: Fix memleak in watchdog_cdev_register

Greg Kroah-Hartman
2020-10-27T17:33:01Z

From: Dinghao Liu <dinghao.liu@zju.edu.cn>

[ Upstream commit 5afb6d203d0293512aa2c6ae098274a2a4f6ed02 ]

When watchdog_kworker is NULL, we should free wd_data
before the function returns to prevent memleak.

Fixes: 664a39236e718 ("watchdog: Introduce hardware maximum heartbeat in watchdog core")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200824024001.25474-1-dinghao.liu@zju.edu.cn
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/watchdog/watchdog_dev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 3729f99fd8eca..694357f2816b3 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -971,8 +971,10 @@ static int watchdog_cdev_register(struct watchdog_device *wdd)
wd_data->wdd = wdd;
wdd->wd_data = wd_data;

- if (IS_ERR_OR_NULL(watchdog_kworker))
+ if (IS_ERR_OR_NULL(watchdog_kworker)) {
+ kfree(wd_data);
return -ENODEV;
+ }

device_initialize(&wd_data->dev);
wd_data->dev.devt = MKDEV(MAJOR(watchdog_devt), wdd->id);
--
2.25.1