From ac938e2ecb48ab4dd21298126c7921689d60571b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Caol=C3=A1n=20McNamara?= <caolanm@redhat.com>
Date: Tue, 12 Nov 2019 20:03:15 +0000
Subject: [PATCH] invalid read memory access #624

---
 src/hunspell/suggestmgr.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/hunspell/suggestmgr.cxx b/src/hunspell/suggestmgr.cxx
index dba084e..c23f165 100644
--- a/src/hunspell/suggestmgr.cxx
+++ b/src/hunspell/suggestmgr.cxx
@@ -1812,7 +1812,7 @@ int SuggestMgr::leftcommonsubstring(char * s1, const char * s2) {
     if (complexprefixes) {
       int l1 = u8_u16(su1, MAXSWL, s1);
       int l2 = u8_u16(su2, MAXSWL, s2);
-      if (*((short *)su1+l1-1) == *((short *)su2+l2-1)) return 1;
+      if (l1 && l2 && *((short *)su1+l1-1) == *((short *)su2+l2-1)) return 1;
     } else {
       int i;
       u8_u16(su1, 1, s1);
-- 
2.23.0