fuzz/detect: forbid rule with any pcre on stream

to avoid fuzzing blocks on timeouts with known bad rules

Completes commit 378f678
after oss-fuzz found another timeout

Ticket: 4858

Author: catenacyber

src/detect-content.c

@@ -454,22 +454,14 @@ void SigParseRequiredContentSize(
 bool DetectContentPMATCHValidateCallback(const Signature *s)
 {
 #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
-    bool has_pcre = false;
-    bool has_content = false;
     for (SigMatch *sm = s->init_data->smlists[DETECT_SM_LIST_PMATCH]; sm != NULL; sm = sm->next) {
         if (sm->type == DETECT_PCRE) {
-            has_pcre = true;
-        } else if (sm->type == DETECT_CONTENT) {
-            has_content = true;
-            break;
+            // Fuzzing does not allow rules with pcre on payload
+            // as it is known to be a bad rule for performance causing possible timeouts
+            // Engine analysis has more generic warn_pcre_no_content about this
+            return false;
         }
     }
-    if (has_pcre && !has_content) {
-        // Fuzzing does not allow rules with pcre and without content on payload
-        // as it is known to be a bad rule for performance causing possible timeouts
-        // Engine analysis has more generic warn_pcre_no_content about this
-        return false;
-    }
 #endif
 
     if (!(s->flags & SIG_FLAG_DSIZE)) {