From: Kyle Manna <kyle@kylemanna.com>
Date: Fri, 12 Aug 2011 03:33:14 +0000 (-0500)
Subject: mfd: Check for twl4030-madc NULL pointer
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d0e84caeb4cd535923884735906e5730329505b4;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

mfd: Check for twl4030-madc NULL pointer

If the twl4030-madc device wasn't registered, and another device, such
as twl4030-madc-hwmon, calls twl4030_madc_conversion() a NULL pointer is
dereferenced.

Signed-off-by: Kyle Manna <kyle@kylemanna.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
---

diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
index cb44b53dee3..7cbf2aa9e64 100644
--- a/drivers/mfd/twl4030-madc.c
+++ b/drivers/mfd/twl4030-madc.c
@@ -510,8 +510,9 @@ int twl4030_madc_conversion(struct twl4030_madc_request *req)
 	u8 ch_msb, ch_lsb;
 	int ret;
 
-	if (!req)
+	if (!req || !twl4030_madc)
 		return -EINVAL;
+
 	mutex_lock(&twl4030_madc->lock);
 	if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
 		ret = -EINVAL;