[PATCH] base: dd: fix error return code of driver_sysfs_add()

[Jia-Ju Bai]

When device_create_file() fails and returns a non-zero value, 
no error return code of driver_sysfs_add() is assigned.
To fix this bug, ret is assigned with the return value of
device_create_file(), and then ret is checked.

Reported-by: TOTE Robot <oslab@xxxxxxxxxxxxxxx>
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
---
 drivers/base/dd.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 9179825ff646..f94bbef95258 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -413,8 +413,11 @@ static int driver_sysfs_add(struct device *dev)
 	if (ret)
 		goto rm_dev;
 
-	if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump ||
-	    !device_create_file(dev, &dev_attr_coredump))
+	if (!IS_ENABLED(CONFIG_DEV_COREDUMP) || !dev->driver->coredump)
+		return 0;
+	
+	ret = device_create_file(dev, &dev_attr_coredump);
+	if (!ret)
 		return 0;
 
 	sysfs_remove_link(&dev->kobj, "driver");
-- 
2.17.1