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, 45 insertions, 0 deletions

diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
new file mode 100644
index 000000000..42760242e
--- /dev/null
+++ b/tools/perf/util/counts.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_COUNTS_H
+#define __PERF_COUNTS_H
+
+#include <linux/types.h>
+#include <internal/xyarray.h>
+#include <perf/evsel.h>
+#include <stdbool.h>
+
+struct evsel;
+
+struct perf_counts {
+	s8			  scaled;
+	struct xyarray		  *values;
+	struct xyarray		  *loaded;
+};
+
+
+static inline struct perf_counts_values*
+perf_counts(struct perf_counts *counts, int cpu_map_idx, int thread)
+{
+	return xyarray__entry(counts->values, cpu_map_idx, thread);
+}
+
+static inline bool
+perf_counts__is_loaded(struct perf_counts *counts, int cpu_map_idx, int thread)
+{
+	return *((bool *) xyarray__entry(counts->loaded, cpu_map_idx, thread));
+}
+
+static inline void
+perf_counts__set_loaded(struct perf_counts *counts, int cpu_map_idx, int thread, bool loaded)
+{
+	*((bool *) xyarray__entry(counts->loaded, cpu_map_idx, thread)) = loaded;
+}
+
+struct perf_counts *perf_counts__new(int ncpus, int nthreads);
+void perf_counts__delete(struct perf_counts *counts);
+void perf_counts__reset(struct perf_counts *counts);
+
+void evsel__reset_counts(struct evsel *evsel);
+int evsel__alloc_counts(struct evsel *evsel);
+void evsel__free_counts(struct evsel *evsel);
+
+#endif /* __PERF_COUNTS_H */