From 263036045a07914c7e54ab774532c08d5a3f9422 Mon Sep 17 00:00:00 2001
From: Joachim Nilsson <troglobit@gmail.com>
Date: Wed, 22 May 2013 12:36:12 +0200
Subject: [PATCH] tty: Check input arguments for invalid tty before adding.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
---
 tty.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tty.c b/tty.c
index f1f1e28b..0d0f736a 100644
--- a/tty.c
+++ b/tty.c
@@ -50,8 +50,12 @@ typedef struct node {
 LIST_HEAD(, node) node_list = LIST_HEAD_INITIALIZER();
 int tty_add(char *tty, int baud)
 {
-	node_t *entry = malloc(sizeof(*entry));
+	node_t *entry;
 
+	if (!tty)
+		return errno = EINVAL;
+
+	entry = malloc(sizeof(*entry));
 	if (!entry)
 		return errno = ENOMEM;