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src/drivers/bus/cdc.c
55 строк
2 KB
Michael Brown
[usb] Guard against invalid descriptor lengths in USB configurations
07 авг 2026, 16:44
07 авг 2026, 16:44
6215a88
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/* * Copyright (C) 2015 Michael Brown <mbrown@fensystems.co.uk>. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. * * You can also choose to distribute this program under the terms of * the Unmodified Binary Distribution Licence (as given in the file * COPYING.UBDL), provided that you have satisfied its requirements. */ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); FILE_SECBOOT ( PERMITTED ); #include <stddef.h> #include <ipxe/usb.h> #include <ipxe/cdc.h> /** @file * * USB Communications Device Class (CDC) * */ /** * Locate CDC union functional descriptor * * @v config Configuration descriptor * @v interface Interface descriptor * @ret desc Union functional descriptor, or NULL if not found */ struct cdc_union_descriptor * cdc_union_descriptor ( struct usb_configuration_descriptor *config, struct usb_interface_descriptor *interface ) { struct cdc_union_descriptor *desc; for_each_interface_descriptor ( desc, config, interface, USB_CS_INTERFACE_DESCRIPTOR ) { if ( desc->subtype == CDC_SUBTYPE_UNION ) return desc; } return NULL; }