staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()grafted

rtw_action_frame_parse() takes a frame_len parameter but never
actually checks it before indexing into the frame body:

	const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr);
	...
	c = frame_body[0];
	...
	a = frame_body[1];

frame_body already points 24 bytes (sizeof(struct
ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and
frame_body[1] requires frame_len >= 26. A management action frame
shorter than that (e.g. exactly 24 bytes, the minimum a malicious
peer can send) causes a 1-2 byte out-of-bounds read.

This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and
cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass
attacker/user-influenced frame buffers and lengths straight through.

Add the missing length check before frame_body is dereferenced.

Fixes: 554c0a3abf216 ("staging: Add rtl8723bs sdio wifi driver")
Cc: stable@vger.kernel.org
Signed-off-by: Muhammad Bilal <meatuni001@gmail.com>
Link: https://patch.msgid.link/20260728125456.32359-3-meatuni001@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/tools/include/nolibc/arch.h b/tools/include/nolibc/arch.h
new file mode 100644
index 000000000..06cc2dbe7
--- /dev/null
+++ b/tools/include/nolibc/arch.h
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Copyright (C) 2017-2022 Willy Tarreau <w@1wt.eu>
+ */
+
+#ifndef _NOLIBC_ARCH_H
+#define _NOLIBC_ARCH_H
+
+#if defined(__x86_64__) || defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__)
+#include "arch-x86.h"
+#elif defined(__ARM_EABI__)
+#include "arch-arm.h"
+#elif defined(__aarch64__)
+#include "arch-arm64.h"
+#elif defined(__mips__)
+#include "arch-mips.h"
+#elif defined(__powerpc__)
+#include "arch-powerpc.h"
+#elif defined(__riscv)
+#include "arch-riscv.h"
+#elif defined(__s390x__)
+#include "arch-s390.h"
+#elif defined(__loongarch__)
+#include "arch-loongarch.h"
+#elif defined(__sparc__)
+#include "arch-sparc.h"
+#elif defined(__m68k__)
+#include "arch-m68k.h"
+#elif defined(__sh__)
+#include "arch-sh.h"
+#elif defined(__or1k__)
+#include "arch-openrisc.h"
+#elif defined(__hppa__)
+#include "arch-parisc.h"
+#elif defined(__alpha__)
+#include "arch-alpha.h"
+#else
+#error Unsupported Architecture
+#endif
+
+#endif /* _NOLIBC_ARCH_H */