MFB: Fix crashes when SAPI handlers are overriden in dl()-ed extensions

main/SAPI.c

@@ -794,6 +794,10 @@ SAPI_API int sapi_register_post_entries(sapi_post_entry *post_entries TSRMLS_DC)
 
 SAPI_API int sapi_register_post_entry(sapi_post_entry *post_entry TSRMLS_DC)
 {
+	if (EG(in_execution)) {
+		return FAILURE;
+	}
+
 	return zend_hash_add(&SG(known_post_content_types),
 			post_entry->content_type, post_entry->content_type_len+1,
 			(void *) post_entry, sizeof(sapi_post_entry), NULL);
@@ -801,6 +805,9 @@ SAPI_API int sapi_register_post_entry(sapi_post_entry *post_entry TSRMLS_DC)
 
 SAPI_API void sapi_unregister_post_entry(sapi_post_entry *post_entry TSRMLS_DC)
 {
+	if (EG(in_execution)) {
+		return;
+	}
 	zend_hash_del(&SG(known_post_content_types), post_entry->content_type,
 			post_entry->content_type_len+1);
 }
@@ -808,6 +815,10 @@ SAPI_API void sapi_unregister_post_entry(sapi_post_entry *post_entry TSRMLS_DC)
 
 SAPI_API int sapi_register_default_post_reader(void (*default_post_reader)(TSRMLS_D))
 {
+	TSRMLS_FETCH();
+	if (EG(in_execution)) {
+		return FAILURE;
+	}
 	sapi_module.default_post_reader = default_post_reader;
 	return SUCCESS;
 }
@@ -815,12 +826,20 @@ SAPI_API int sapi_register_default_post_reader(void (*default_post_reader)(TSRML
 
 SAPI_API int sapi_register_treat_data(void (*treat_data)(int arg, char *str, zval *destArray TSRMLS_DC))
 {
+	TSRMLS_FETCH();
+	if (EG(in_execution)) {
+		return FAILURE;
+	}
 	sapi_module.treat_data = treat_data;
 	return SUCCESS;
 }
 
 SAPI_API int sapi_register_input_filter(unsigned int (*input_filter)(int arg, char *var, char **val, unsigned int val_len, unsigned int *new_val_len TSRMLS_DC))
 {
+	TSRMLS_FETCH();
+	if (EG(in_execution)) {
+		return FAILURE;
+	}
 	sapi_module.input_filter = input_filter;
 	return SUCCESS;
 }