From: Kornel Benko <kornel@lyx.org>
Date: Tue, 26 May 2020 13:58:23 +0000 (+0200)
Subject: Findadv: Do not use out of range index into a string
X-Git-Tag: lyx-2.4.0dev-acb2ca7b~823
X-Git-Url: https://git.lyx.org/gitweb/?a=commitdiff_plain;h=8dd2ac717148786acaafc5a2db75552b53083f01;p=features.git

Findadv: Do not use out of range index into a string

Thanks Scott. Crashing if using _GLIBCXX_DEBUG preprocessor setting
---

diff --git a/src/lyxfind.cpp b/src/lyxfind.cpp
index f98f525cbe..ab5d98580e 100644
--- a/src/lyxfind.cpp
+++ b/src/lyxfind.cpp
@@ -2432,7 +2432,7 @@ int LatexInfo::dispatch(ostringstream &os, int previousStart, KeyInfo &actual)
       int val = actual._tokenstart;
       for (count = 0; count < actual._tokenstart;) {
         val = interval_.previousNotIgnored(val-1);
-        if (interval_.par[val] != ' ')
+        if (val < 0 || interval_.par[val] != ' ')
           break;
         else {
           count = actual._tokenstart - val;