From a823e76138466225d0a9f45520c5654132939a01 Mon Sep 17 00:00:00 2001
From: Xiubo Li <Li.Xiubo@freescale.com>
Date: Sun, 28 Sep 2014 01:57:15 -0700
Subject: [PATCH] led: gpio: Fix possible ZERO_SIZE_PTR pointer dereferencing
 error.

Since we cannot make sure the 'pdata->num_leds' will always be none
zero here, and then if it equals to zero, the kmemdup() will return
ZERO_SIZE_PTR, which equals to ((void *)16).

So this patch fix this with just doing the zero check before calling
kmemdup().

Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
---
 drivers/leds/leds-gpio-register.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/leds/leds-gpio-register.c b/drivers/leds/leds-gpio-register.c
index fbd89344bec4..75717ba68ae0 100644
--- a/drivers/leds/leds-gpio-register.c
+++ b/drivers/leds/leds-gpio-register.c
@@ -28,6 +28,9 @@ struct platform_device *__init gpio_led_register_device(
 	struct platform_device *ret;
 	struct gpio_led_platform_data _pdata = *pdata;
 
+	if (!pdata->num_leds)
+		return ERR_PTR(-EINVAL);
+
 	_pdata.leds = kmemdup(pdata->leds,
 			pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
 	if (!_pdata.leds)