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, 138 insertions, 0 deletions

diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
new file mode 100644
index 000000000..37195edf2
--- /dev/null
+++ b/include/trace/events/cma.h
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cma
+
+#if !defined(_TRACE_CMA_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CMA_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(cma_release,
+
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+		 unsigned long count),
+
+	TP_ARGS(name, pfn, page, count),
+
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(unsigned long, pfn)
+		__field(const struct page *, page)
+		__field(unsigned long, count)
+	),
+
+	TP_fast_assign(
+		__assign_str(name);
+		__entry->pfn = pfn;
+		__entry->page = page;
+		__entry->count = count;
+	),
+
+	TP_printk("name=%s pfn=0x%lx page=%p count=%lu",
+		  __get_str(name),
+		  __entry->pfn,
+		  __entry->page,
+		  __entry->count)
+);
+
+TRACE_EVENT(cma_alloc_start,
+
+	TP_PROTO(const char *name, unsigned long request_count, unsigned long available_count,
+		unsigned long total_count, unsigned int align),
+
+	TP_ARGS(name, request_count, available_count, total_count, align),
+
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(unsigned long, request_count)
+		__field(unsigned long, available_count)
+		__field(unsigned long, total_count)
+		__field(unsigned int, align)
+	),
+
+	TP_fast_assign(
+		__assign_str(name);
+		__entry->request_count = request_count;
+		__entry->available_count = available_count;
+		__entry->total_count = total_count;
+		__entry->align = align;
+	),
+
+	TP_printk("name=%s request_count=%lu available_count=%lu total_count=%lu align=%u",
+		  __get_str(name),
+		  __entry->request_count,
+		  __entry->available_count,
+		  __entry->total_count,
+		  __entry->align)
+);
+
+TRACE_EVENT(cma_alloc_finish,
+
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+		 unsigned long count, unsigned int align, int errorno),
+
+	TP_ARGS(name, pfn, page, count, align, errorno),
+
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(unsigned long, pfn)
+		__field(const struct page *, page)
+		__field(unsigned long, count)
+		__field(unsigned int, align)
+		__field(int, errorno)
+	),
+
+	TP_fast_assign(
+		__assign_str(name);
+		__entry->pfn = pfn;
+		__entry->page = page;
+		__entry->count = count;
+		__entry->align = align;
+		__entry->errorno = errorno;
+	),
+
+	TP_printk("name=%s pfn=0x%lx page=%p count=%lu align=%u errorno=%d",
+		  __get_str(name),
+		  __entry->pfn,
+		  __entry->page,
+		  __entry->count,
+		  __entry->align,
+		  __entry->errorno)
+);
+
+TRACE_EVENT(cma_alloc_busy_retry,
+
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
+		 unsigned long count, unsigned int align),
+
+	TP_ARGS(name, pfn, page, count, align),
+
+	TP_STRUCT__entry(
+		__string(name, name)
+		__field(unsigned long, pfn)
+		__field(const struct page *, page)
+		__field(unsigned long, count)
+		__field(unsigned int, align)
+	),
+
+	TP_fast_assign(
+		__assign_str(name);
+		__entry->pfn = pfn;
+		__entry->page = page;
+		__entry->count = count;
+		__entry->align = align;
+	),
+
+	TP_printk("name=%s pfn=0x%lx page=%p count=%lu align=%u",
+		  __get_str(name),
+		  __entry->pfn,
+		  __entry->page,
+		  __entry->count,
+		  __entry->align)
+);
+
+#endif /* _TRACE_CMA_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>