MFB: Fixed a possible crash inside OnUpdateErrorLog() when restoring an empty value

Avoid pointless safe_mode/open_basedir checks on OnUpdateMailLog() if value is empty

main/main.c

@@ -467,13 +467,10 @@ static PHP_INI_DISP(display_errors_mode)
 static PHP_INI_MH(OnUpdateErrorLog)
 {
 	/* Only do the safemode/open_basedir check at runtime */
-	if ((stage == PHP_INI_STAGE_RUNTIME || stage == PHP_INI_STAGE_HTACCESS) &&
-		strcmp(new_value, "syslog")) {
-
+	if ((stage == PHP_INI_STAGE_RUNTIME || stage == PHP_INI_STAGE_HTACCESS) && new_value && strcmp(new_value, "syslog")) {
 		if (PG(open_basedir) && php_check_open_basedir(new_value TSRMLS_CC)) {
 			return FAILURE;
 		}
-
 	}
 	OnUpdateString(entry, new_value, new_value_length, mh_arg1, mh_arg2, mh_arg3, stage TSRMLS_CC);
 	return SUCCESS;
@@ -485,11 +482,10 @@ static PHP_INI_MH(OnUpdateErrorLog)
 static PHP_INI_MH(OnUpdateMailLog)
 {
 	/* Only do the safemode/open_basedir check at runtime */
-	if (stage == PHP_INI_STAGE_RUNTIME || stage == PHP_INI_STAGE_HTACCESS) {
+	if ((stage == PHP_INI_STAGE_RUNTIME || stage == PHP_INI_STAGE_HTACCESS) && new_value) {
 		if (PG(open_basedir) && php_check_open_basedir(new_value TSRMLS_CC)) {
 			return FAILURE;
 		}
-
 	}
 	OnUpdateString(entry, new_value, new_value_length, mh_arg1, mh_arg2, mh_arg3, stage TSRMLS_CC);
 	return SUCCESS;