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>

2 files changed, 64 insertions, 0 deletions

diff --git a/tools/arch/xtensa/include/asm/barrier.h b/tools/arch/xtensa/include/asm/barrier.h
new file mode 100644
index 000000000..583800bd7
--- /dev/null
+++ b/tools/arch/xtensa/include/asm/barrier.h
@@ -0,0 +1,18 @@
+/*
+ * Copied from the kernel sources to tools/:
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2001 - 2012 Tensilica Inc.
+ */
+
+#ifndef _TOOLS_LINUX_XTENSA_SYSTEM_H
+#define _TOOLS_LINUX_XTENSA_SYSTEM_H
+
+#define mb()  ({ __asm__ __volatile__("memw" : : : "memory"); })
+#define rmb() barrier()
+#define wmb() mb()
+
+#endif /* _TOOLS_LINUX_XTENSA_SYSTEM_H */
diff --git a/tools/arch/xtensa/include/uapi/asm/mman.h b/tools/arch/xtensa/include/uapi/asm/mman.h
new file mode 100644
index 000000000..f2b08c990
--- /dev/null
+++ b/tools/arch/xtensa/include/uapi/asm/mman.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef TOOLS_ARCH_XTENSA_UAPI_ASM_MMAN_FIX_H
+#define TOOLS_ARCH_XTENSA_UAPI_ASM_MMAN_FIX_H
+#define MADV_DODUMP	17
+#define MADV_DOFORK	11
+#define MADV_DONTDUMP   16
+#define MADV_DONTFORK	10
+#define MADV_DONTNEED	4
+#define MADV_FREE	8
+#define MADV_HUGEPAGE	14
+#define MADV_MERGEABLE   12
+#define MADV_NOHUGEPAGE	15
+#define MADV_NORMAL	0
+#define MADV_RANDOM	1
+#define MADV_REMOVE	9
+#define MADV_SEQUENTIAL	2
+#define MADV_UNMERGEABLE 13
+#define MADV_WILLNEED	3
+#define MAP_ANONYMOUS	0x0800
+#define MAP_DENYWRITE	0x2000
+#define MAP_EXECUTABLE	0x4000
+#define MAP_FILE	0
+#define MAP_FIXED	0x010
+#define MAP_GROWSDOWN	0x1000
+#define MAP_HUGETLB	0x80000
+#define MAP_LOCKED	0x8000
+#define MAP_NONBLOCK	0x20000
+#define MAP_NORESERVE	0x0400
+#define MAP_POPULATE	0x10000
+#define MAP_STACK	0x40000
+#define PROT_EXEC	0x4
+#define PROT_GROWSDOWN	0x01000000
+#define PROT_GROWSUP	0x02000000
+#define PROT_NONE	0x0
+#define PROT_READ	0x1
+#define PROT_SEM	0x10
+#define PROT_WRITE	0x2
+/* MADV_HWPOISON is undefined on xtensa, fix it for perf */
+#define MADV_HWPOISON	100
+/* MADV_SOFT_OFFLINE is undefined on xtensa, fix it for perf */
+#define MADV_SOFT_OFFLINE 101
+/* MAP_32BIT is undefined on xtensa, fix it for perf */
+#define MAP_32BIT	0
+/* MAP_UNINITIALIZED is undefined on xtensa, fix it for perf */
+#define MAP_UNINITIALIZED	0
+#endif