From 9fa5895bb544b4cb683224ffe61685c75f79482c Mon Sep 17 00:00:00 2001
From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Tue, 17 Jan 2017 17:21:28 +0100
Subject: [PATCH] gpiomon: check if offset is not negative

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
---
 src/tools/gpiomon.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/tools/gpiomon.c b/src/tools/gpiomon.c
index c8157cc..10e7e35 100644
--- a/src/tools/gpiomon.c
+++ b/src/tools/gpiomon.c
@@ -15,6 +15,7 @@
 #include <string.h>
 #include <getopt.h>
 #include <signal.h>
+#include <limits.h>
 
 static const struct option longopts[] = {
 	{ "help",		no_argument,		NULL,	'h' },
@@ -158,7 +159,7 @@ int main(int argc, char **argv)
 
 	device = argv[0];
 	offset = strtoul(argv[1], &end, 10);
-	if (*end != '\0')
+	if (*end != '\0' || offset > INT_MAX)
 		die("invalid GPIO offset: %s", argv[1]);
 
 	timeout.tv_sec = 0;
-- 
2.30.2