From 16f10a825da5b9361ef8e8da76720c37f0116da4 Mon Sep 17 00:00:00 2001
From: Daeseok Youn <daeseok.youn@gmail.com>
Date: Tue, 5 Apr 2016 18:29:43 +0900
Subject: staging: dgnc: return -ENOMEM when kzalloc failed

The kzalloc can be failed when memory is not enough
to allocate. When kzalloc failed, it need to return
error code with ENOMEM

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 5832190..7f73a41 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1106,6 +1106,14 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
 	if (!ch->ch_wqueue)
 		ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL);
 
+	if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) {
+		kfree(ch->ch_rqueue);
+		kfree(ch->ch_equeue);
+		kfree(ch->ch_wqueue);
+
+		return -ENOMEM;
+	}
+
 	spin_lock_irqsave(&ch->ch_lock, flags);
 
 	ch->ch_flags &= ~(CH_OPENING);
-- 
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