From 17d98dbde125ffb11511673105ac2d1fd2a9d826 Mon Sep 17 00:00:00 2001
From: Xiaojun Sang <xsang@codeaurora.org>
Date: Tue, 20 Sep 2016 16:22:49 +0800
Subject: [PATCH] ASoC: wcd: add null check before pointer dereference

Slimbus device pointer may be null, which may lead to
null pointer dereference.

CRs-Fixed: 1054973
Signed-off-by: Xiaojun Sang <xsang@codeaurora.org>
Change-Id: Ica22ee19f281fa0cff7d629f396c41c935692c59
---
 drivers/mfd/wcd9xxx-core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/mfd/wcd9xxx-core.c b/drivers/mfd/wcd9xxx-core.c
index 981d372277ee..5bcd0db929b3 100644
--- a/drivers/mfd/wcd9xxx-core.c
+++ b/drivers/mfd/wcd9xxx-core.c
@@ -1219,6 +1219,11 @@ static int wcd9xxx_slim_probe(struct slim_device *slim)
 
 	intf_type = wcd9xxx_get_intf_type();
 
+	if (!slim) {
+		ret = -EINVAL;
+		goto err;
+	}
+
 	if (intf_type == WCD9XXX_INTERFACE_TYPE_I2C) {
 		dev_dbg(&slim->dev, "%s:Codec is detected in I2C mode\n",
 			__func__);