From: Fletcher T. Penney <fletcher@fletcherpenney.net>
Date: Wed, 15 Mar 2017 03:50:26 +0000 (-0400)
Subject: FIXED: Fix potential bug in Aho-Corasick search:
X-Git-Tag: 6.0.0-rc1^2~9
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=11f1f0e137a67abdcc99893608ea15675e76ada8;p=multimarkdown

FIXED: Fix potential bug in Aho-Corasick search:
---

diff --git a/Sources/libMultiMarkdown/aho-corasick.c b/Sources/libMultiMarkdown/aho-corasick.c
index 9633e76..fb3255f 100644
--- a/Sources/libMultiMarkdown/aho-corasick.c
+++ b/Sources/libMultiMarkdown/aho-corasick.c
@@ -331,6 +331,7 @@ match * match_new(size_t start, size_t len, unsigned short match_type) {
 		m->len = len;
 		m->match_type = match_type;
 		m->next = NULL;
+		m->prev = NULL;
 	}
 
 	return m;
@@ -483,7 +484,8 @@ void match_set_filter_leftmost_longest(match * header) {
 			}
 		}
 
-		while (m->prev->len && 
+		while (m->prev &&
+			m->prev->len &&
 			m->prev->start >= m->start) {
 			// We are "lefter" than previous
 			n = m->prev;