# \[PATCH\] backlight: check null deference of name when device is registered

- From: Jingoo Han \<hidden\>
- Date: 2013-01-04 08:29:17 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2013/01/3978338
- Thread: https://ratatoskr.run/linux-fbdev/2013/01/3978338/t.md

```text
NULL deference of name is checked when device is registered.
If the name is null, it will cause a kernel oops in dev_set_name().

Acked-by: Devendra Naga <redacted>
Signed-off-by: Jingoo Han <redacted>
---
 drivers/video/backlight/backlight.c |    5 +++++
 drivers/video/backlight/lcd.c       |    5 +++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 345f666..f2db904 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -292,6 +292,11 @@ struct backlight_device *backlight_device_register(const char *name,
 	struct backlight_device *new_bd;
 	int rc;
 
+	if (name = NULL) {
+		pr_err("backlight name is null\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	pr_debug("backlight_device_register: name=%s\n", name);
 
 	new_bd = kzalloc(sizeof(struct backlight_device), GFP_KERNEL);
diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index 34fb6bd..3d0ac0c 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -207,6 +207,11 @@ struct lcd_device *lcd_device_register(const char *name, struct device *parent,
 	struct lcd_device *new_ld;
 	int rc;
 
+	if (name = NULL) {
+		pr_err("lcd name is null\n");
+		return ERR_PTR(-EINVAL);
+	}
+
 	pr_debug("lcd_device_register: name=%s\n", name);
 
 	new_ld = kzalloc(sizeof(struct lcd_device), GFP_KERNEL);
-- 
1.7.2.5


```