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 dba084e9..c23f165a 100644
--- a/src/hunspell/suggestmgr.cxx
+++ b/src/hunspell/suggestmgr.cxx
@@ -2040,7 +2040,7 @@ int SuggestMgr::leftcommonsubstring(
   int l2 = su2.size();
   // decapitalize dictionary word
   if (complexprefixes) {
-    if (su1[l1 - 1] == su2[l2 - 1])
+    if (l1 && l2 && su1[l1 - 1] == su2[l2 - 1])
       return 1;
   } else {
     unsigned short idx = su2.empty() ? 0 : (su2[0].h << 8) + su2[0].l;