From 0ece6b50f153fe2d349f4d26b18de4b0a3273537 Mon Sep 17 00:00:00 2001
From: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Date: Thu, 7 May 2015 21:29:18 +0300
Subject: [PATCH] pxe: Fix crash if 'sysboot' is run without args

Previously, a NULL pointer dereference would occur if the 'sysboot'
command is executed without any arguments.

Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 common/cmd_pxe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/cmd_pxe.c b/common/cmd_pxe.c
index 4cbb2b11734..abf0941b579 100644
--- a/common/cmd_pxe.c
+++ b/common/cmd_pxe.c
@@ -1648,7 +1648,7 @@ static int do_sysboot(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 
 	is_pxe = false;
 
-	if (strstr(argv[1], "-p")) {
+	if (argc > 1 && strstr(argv[1], "-p")) {
 		prompt = 1;
 		argc--;
 		argv++;