Introduced a max_file_uploads INI setting, which is set to limit the

number of file uploads per-request to 100 by default, to prevent possible
DOS via temporary file exhaustion.

main/main.c

@@ -602,6 +602,7 @@ PHP_INI_BEGIN()
 	PHP_INI_ENTRY("mail.force_extra_parameters",NULL,		PHP_INI_SYSTEM|PHP_INI_PERDIR,		OnChangeMailForceExtra)
 	PHP_INI_ENTRY("disable_functions",			"",			PHP_INI_SYSTEM,		NULL)
 	PHP_INI_ENTRY("disable_classes",			"",			PHP_INI_SYSTEM,		NULL)
+	PHP_INI_ENTRY("max_file_uploads",			"100",			PHP_INI_SYSTEM,		NULL)
 
 	STD_PHP_INI_BOOLEAN("allow_url_fopen",		"1",		PHP_INI_ALL,		OnUpdateAllowUrl,	allow_url_fopen_list,	php_core_globals,	core_globals)
 	STD_PHP_INI_BOOLEAN("allow_url_include",	"0",		PHP_INI_ALL,		OnUpdateAllowUrl,	allow_url_include_list,	php_core_globals,	core_globals)

main/rfc1867.c

@@ -594,6 +594,12 @@ SAPI_API SAPI_POST_HANDLER_FUNC(rfc1867_post_handler)
 	zend_llist header;
 	void *event_extra_data = NULL;
 	int llen = 0;
+	char *max_uploads = INI_STR("max_file_uploads");
+	int upload_cnt = 0;
+
+	if (max_uploads && *max_uploads) {
+		upload_cnt = atoi(max_uploads);
+	}
 
 	if (SG(request_info).content_length > SG(post_max_size)) {
 		sapi_module.sapi_error(E_WARNING, "POST Content-Length of %ld bytes exceeds the limit of %ld bytes", SG(request_info).content_length, SG(post_max_size));
@@ -740,6 +746,9 @@ SAPI_API SAPI_POST_HANDLER_FUNC(rfc1867_post_handler)
 			/* If file_uploads=off, skip the file part */
 			if (!PG(file_uploads)) {
 				skip_upload = 1;
+			} else if (upload_cnt <= 0) {
+				skip_upload = 1;
+				sapi_module.sapi_error(E_WARNING, "Maximum number of allowable file uploads has been exceeded");
 			}
 
 			/* Return with an error if the posted data is garbled */
@@ -784,6 +793,7 @@ SAPI_API SAPI_POST_HANDLER_FUNC(rfc1867_post_handler)
 			if (!skip_upload) {
 				/* Handle file */
 				fd = php_open_temporary_fd(PG(upload_tmp_dir), "php", &temp_filename TSRMLS_CC);
+				upload_cnt--;
 				if (fd==-1) {
 					sapi_module.sapi_error(E_WARNING, "File upload error - unable to create a temporary file");
 					cancel_upload = UPLOAD_ERROR_E;

php.ini-development

@@ -878,6 +878,9 @@ file_uploads = On
 ; http://php.net/upload-max-filesize
 upload_max_filesize = 2M
 
+; Maximum number of files that can be uploaded via a single request
+max_file_uploads = 100
+
 ;;;;;;;;;;;;;;;;;;
 ; Fopen wrappers ;
 ;;;;;;;;;;;;;;;;;;

php.ini-production

@@ -878,6 +878,9 @@ file_uploads = On
 ; http://php.net/upload-max-filesize
 upload_max_filesize = 2M
 
+; Maximum number of files that can be uploaded via a single request
+max_file_uploads = 100
+
 ;;;;;;;;;;;;;;;;;;
 ; Fopen wrappers ;
 ;;;;;;;;;;;;;;;;;;