From: Peng Fan <peng.fan@nxp.com>
Date: Tue, 2 Jan 2018 07:25:36 +0000 (+0800)
Subject: video: ipu: Fix dereferencing NULL pointer problem
X-Git-Tag: v2018.01~6
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=cca3ff054ab3e1f5f0d3f2d58da263cae201db50;p=u-boot

video: ipu: Fix dereferencing NULL pointer problem

The clk_set_rate function dereferences the clk pointer without
checking whether it is NULL. This may cause problem when clk is NULL.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
---

diff --git a/drivers/video/ipu_common.c b/drivers/video/ipu_common.c
index 96229da502..889085aa76 100644
--- a/drivers/video/ipu_common.c
+++ b/drivers/video/ipu_common.c
@@ -132,8 +132,12 @@ struct clk *clk_get_parent(struct clk *clk)
 
 int clk_set_rate(struct clk *clk, unsigned long rate)
 {
-	if (clk && clk->set_rate)
+	if (!clk)
+		return 0;
+
+	if (clk->set_rate)
 		clk->set_rate(clk, rate);
+
 	return clk->rate;
 }