From 723b842ca1de2f8565717d7099f8ff61b63f6026 Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <doxygen@gmail.com>
Date: Sun, 12 May 2019 14:23:55 +0200
Subject: Fixed memory leak in reentrant lexers

---
 src/constexp.l | 5 ++++-
 src/declinfo.l | 8 +++++---
 src/sqlcode.l  | 5 ++++-
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/constexp.l b/src/constexp.l
index f5862c7..86cf4c7 100644
--- a/src/constexp.l
+++ b/src/constexp.l
@@ -126,7 +126,10 @@ bool parseconstexp(const char *fileName,int lineNr,const QCString &s)
 
   //printf("Result: %ld\n",(long)g_resultValue);
   printlex(yy_flex_debug, FALSE, __FILE__, fileName);
-  return (long)yyextra->g_resultValue!=0;
+  bool result = (long)yyextra->g_resultValue!=0;
+
+  constexpYYlex_destroy(yyscanner);
+  return result;
 }
 
 extern "C" {
diff --git a/src/declinfo.l b/src/declinfo.l
index 696d000..e7e9164 100644
--- a/src/declinfo.l
+++ b/src/declinfo.l
@@ -243,13 +243,16 @@ static struct declinfoYY_state g_declinfo_extra;
 void parseFuncDecl(const QCString &decl,bool objC,QCString &cl,QCString &t,
                    QCString &n,QCString &a,QCString &ftl,QCString &exc)
 {
+  if (decl.isEmpty())
+  {
+    return;
+  }
   declinfoYYlex_init_extra(&g_declinfo_extra, &g_yyscanner);
   struct yyguts_t *yyg = (struct yyguts_t*)g_yyscanner;
 
   printlex(yy_flex_debug, TRUE, __FILE__, NULL);
   yyextra->inputString   = decl;
   //printf("Input=`%s'\n",yyextra->inputString);
-  if (yyextra->inputString==0) return;
   yyextra->inputPosition      = 0;
   yyextra->classTempListFound = FALSE;
   yyextra->funcTempListFound  = FALSE;
@@ -324,9 +327,8 @@ void parseFuncDecl(const QCString &decl,bool objC,QCString &cl,QCString &t,
   //        t.data(),cl.data(),n.data(),a.data());
 
   printlex(yy_flex_debug, FALSE, __FILE__, NULL);
+  declinfoYYlex_destroy(g_yyscanner);
   return;
-  
-  
 }
 
 //extern "C" { // some bogus code to keep the compiler happy
diff --git a/src/sqlcode.l b/src/sqlcode.l
index 59de849..c3dd679 100644
--- a/src/sqlcode.l
+++ b/src/sqlcode.l
@@ -375,9 +375,10 @@ void parseSqlCode(
     bool /*collectXRefs*/
     ) 
 {  
+  if (s.isEmpty()) return;
+
   sqlcodeYYlex_init_extra(&sqlcode_extra, &yyscanner);
   struct yyguts_t *yyg = (struct yyguts_t*)yyscanner;
-  if (s.isEmpty()) return;
   
   yyextra->code = &od;
   yyextra->inputString   = s;
@@ -432,6 +433,8 @@ void parseSqlCode(
     delete yyextra->sourceFileDef;
     yyextra->sourceFileDef=0;
   }
+
+  sqlcodeYYlex_destroy(yyscanner);
   
   return;
 }
-- 
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