From: cym <cym@rock-chips.com>
Date: Tue, 8 Oct 2013 07:02:19 +0000 (+0800)
Subject: ddrfreq:fix bug and add check vzalloc
X-Git-Tag: firefly_0821_release~6580
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8c9b21bad052c794cd5934e8acfe3992ac30887b;p=firefly-linux-kernel-4.4.55.git

ddrfreq:fix bug and add check vzalloc
---

diff --git a/arch/arm/plat-rk/ddr_freq.c b/arch/arm/plat-rk/ddr_freq.c
index 0ae0b7d16f20..c105e457c2bc 100755
--- a/arch/arm/plat-rk/ddr_freq.c
+++ b/arch/arm/plat-rk/ddr_freq.c
@@ -300,9 +300,14 @@ static ssize_t video_state_write(struct file *file, const char __user *buffer,
 	uint32_t v_width=0,v_height=0,v_sync=0;
 	cookie_pot = buf;
 
-	if (count < 1)
+	if(!buf)
+		return -ENOMEM;
+
+	if (count < 1){
 		vfree(buf);
-		return count;
+		return -EPERM;
+	}
+
 	if (copy_from_user(cookie_pot, buffer, count)) {
 		vfree(buf);
 		return -EFAULT;