From 1242423ca8492aafa649f4e50ec69cbab024b473 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20T=C5=AFma?= <tumic@cbox.cz>
Date: Wed, 23 Nov 2016 18:44:22 +0100
Subject: [PATCH] Fixed possible invalid memory access

---
 src/nmeaparser.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/nmeaparser.cpp b/src/nmeaparser.cpp
index cef67d32..0792b457 100644
--- a/src/nmeaparser.cpp
+++ b/src/nmeaparser.cpp
@@ -7,10 +7,10 @@ static bool validSentence(const char  *line, int len)
 {
 	const char *lp;
 
-	if (len < 10 || line[0] != '$')
+	if (len < 12 || line[0] != '$')
 		return false;
 
-	for (lp = line + len - 1; lp > line; lp--)
+	for (lp = line + len - 1; lp > line + 3; lp--)
 		if (!::isspace(*lp))
 			break;
 	if (*(lp-2) != '*' || !::isalnum(*(lp-1)) || !::isalnum(*(lp)))