detect/parse: set limits for pcre2

Ticket: 6889

To avoid regexp dos with too much backtracking.
This is already done on pcre keyword, and pcrexform transform.
We use the same default limits for rules parsing.

(cherry picked from commit 316cc528f7)

Using pcre1 in master6

src/detect-parse.c

@@ -2497,7 +2497,14 @@ bool DetectSetupParseRegexesOpts(const char *parse_str, DetectParseRegex *detect
         SCLogError(SC_ERR_PCRE_STUDY, "pcre study failed: %s", eb);
         return false;
     }
-
+    if (detect_parse->study != NULL) {
+        detect_parse->study->match_limit = SC_MATCH_LIMIT_DEFAULT;
+        detect_parse->study->flags |= PCRE_EXTRA_MATCH_LIMIT;
+#ifndef NO_PCRE_MATCH_RLIMIT
+        detect_parse->study->match_limit_recursion = SC_MATCH_LIMIT_RECURSION_DEFAULT;
+        detect_parse->study->flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
+#endif /* NO_PCRE_MATCH_RLIMIT */
+    }
 
     DetectParseRegexAddToFreeList(detect_parse);