From 9062d50e75c24dc7911be05c9b1719b3b256af15 Mon Sep 17 00:00:00 2001 From: Liu Chao Date: Mon, 21 Sep 2026 15:25:51 +0800 Subject: usb: gadget: f_uac1_legacy: validate bRequest index in generic_{set,get}_cmd generic_set_cmd() and generic_get_cmd() use the low nibble of ctrl->bRequest as an index into con->data[]: u8 cmd = (ctrl->bRequest & 0x0F); /* 0 .. 15 */ ... con->data[cmd] = value; /* OOB when cmd >= 5 */ struct usb_audio_control (include/linux/usb/audio.h) declares data as a 5-element array, so indices 5 through 15 write (or read) up to 44 bytes past the end of the array on the heap. A malicious USB host can craft a class-specific SET_CUR / GET_CUR request with an arbitrary bRequest value, triggering the out-of-bounds access from an IRQ completion handler with no further preconditions. Add an ARRAY_SIZE() guard to both functions. Fixes: c47d7b09891a ("USB: audio: add USB audio class definitions") Cc: stable Reviewed-by: Weibin Liu Signed-off-by: Liu Chao Reviewed-by: Ivy Lopez Link: https://patch.msgid.link/20260921072551.3708191-1-liuc63@xiaopeng.com Signed-off-by: Greg Kroah-Hartman --- include/net/dcbevent.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 include/net/dcbevent.h (limited to 'include/net/dcbevent.h') diff --git a/include/net/dcbevent.h b/include/net/dcbevent.h new file mode 100644 index 000000000..02700262f --- /dev/null +++ b/include/net/dcbevent.h @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (c) 2010, Intel Corporation. + * + * Author: John Fastabend + */ + +#ifndef _DCB_EVENT_H +#define _DCB_EVENT_H + +struct notifier_block; + +enum dcbevent_notif_type { + DCB_APP_EVENT = 1, +}; + +#ifdef CONFIG_DCB +int register_dcbevent_notifier(struct notifier_block *nb); +int unregister_dcbevent_notifier(struct notifier_block *nb); +int call_dcbevent_notifiers(unsigned long val, void *v); +#else +static inline int +register_dcbevent_notifier(struct notifier_block *nb) +{ + return 0; +} + +static inline int unregister_dcbevent_notifier(struct notifier_block *nb) +{ + return 0; +} + +static inline int call_dcbevent_notifiers(unsigned long val, void *v) +{ + return 0; +} +#endif /* CONFIG_DCB */ + +#endif -- cgit v1.3.1