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

[Jingoo Han]

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 <devendra.a...@gmail.com>
Signed-off-by: Jingoo Han <jg1....@samsung.com>
---
 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


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