Fix pcretest crash with /g and zero-length ovector.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@1515 2f5784b3-3f2a-0410-8824-cb99058d5e15

2 files changed, 9 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 72bb80a..d962488 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -16,6 +16,9 @@ Version 8.37 xx-xxx-201x
     
 3.  If a pattern in pcretest input had the P (POSIX) modifier followed by an
     unrecognized modifier, a crash could occur. 
+    
+4.  An attempt to do global matching in pcretest with a zero-length ovector
+    caused a crash. 
 
 
 
diff --git a/pcretest.c b/pcretest.c
index 2dc2061..e28f897 100644
--- a/pcretest.c
+++ b/pcretest.c
@@ -5603,6 +5603,12 @@ while (!done)
       /* If not /g or /G we are done */
 
       if (!do_g && !do_G) break;
+      
+      if (use_offsets == NULL)
+        {
+        fprintf(outfile, "Cannot do global matching without an ovector\n");
+        break;
+        }    
 
       /* If we have matched an empty string, first check to see if we are at
       the end of the subject. If so, the /g loop is over. Otherwise, mimic what