Fix overrun bug in recent property name parsing change

ChangeLog

@@ -62,6 +62,10 @@ including Bidi_Control.
     (d) The standard Unicode 4-letter abbreviations for script names are now 
         recognized.
         
+    (e) In accordance with Unicode and Perl's "loose matching" rules, spaces,
+        hyphens, and underscores are ignored in property names, which are then 
+        matched independent of case. 
+
 18. The Python scripts in the maint directory have been refactored. There are
 now three scripts that generate pcre2_ucd.c, pcre2_ucp.h, and pcre2_ucptables.c
 (which is #included by pcre2_tables.c). The data lists that used to be

src/pcre2_compile.c

@@ -2115,7 +2115,11 @@ if (c == CHAR_LEFT_CURLY_BRACKET)
     {
     if (ptr >= cb->end_pattern) goto ERROR_RETURN;
     c = *ptr++;
-    while (c == '_' || c == '-' || isspace(c)) c = *ptr++;
+    while (c == '_' || c == '-' || isspace(c)) 
+      {
+      if (ptr >= cb->end_pattern) goto ERROR_RETURN;
+      c = *ptr++;
+      } 
     if (c == CHAR_NUL) goto ERROR_RETURN;
     if (c == CHAR_RIGHT_CURLY_BRACKET) break;
     name[i] = tolower(c);

testdata/testinput5

@@ -2208,4 +2208,8 @@
 /\p{soft dotted}\p{sd}/g,utf
     >AF23<>\x{1df1a}\x{69}<>yz<
     
+# ------------------------------------------------ 
+
+/\p{\2b[:x臺gi:t:_/
+
 # End of testinput5

testdata/testoutput5

@@ -5011,4 +5011,9 @@ Failed: error 147 at offset 8: unknown property after \P or \p
     >AF23<>\x{1df1a}\x{69}<>yz<
  0: \x{1df1a}i
     
+# ------------------------------------------------ 
+
+/\p{\2b[:xäigi:t:_/
+Failed: error 146 at offset 17: malformed \P or \p sequence
+
 # End of testinput5