[PATCH v2] chardev: check return value of kobject_set_name() in __register_chrdev()

[PATCH v2] chardev: check return value of kobject_set_name() in __register_chrdev()

[phucduc.bui]

From: bui duc phuc <phucduc.bui@gmail.com>

The kobject_set_name() function can fail and return -ENOMEM if memory
allocation fails.

While all other functions called inside __register_chrdev() are properly
checked for errors, kobject_set_name() was missing this check. Add the
error check for kobject_set_name() and jump to the 'out' label on failure
to maintain consistency and ensure proper error handling.

Found by manual code inspection.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---

Changes in v2:
 - Add Reviewed-by tag from Jan Kara.

 fs/char_dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/char_dev.c b/fs/char_dev.c
index 00229e25c10f..5ce5423f6c99 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -280,7 +280,9 @@ int __register_chrdev(unsigned int major, unsigned int baseminor,
 
 	cdev->owner = fops->owner;
 	cdev->ops = fops;
-	kobject_set_name(&cdev->kobj, "%s", name);
+	err = kobject_set_name(&cdev->kobj, "%s", name);
+	if (err)
+		goto out;
 
 	err = cdev_add(cdev, MKDEV(cd->major, baseminor), count);
 	if (err)
-- 
2.43.0