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, 44 insertions, 0 deletions

diff --git a/tools/perf/util/aslr.h b/tools/perf/util/aslr.h
new file mode 100644
index 000000000..522e31c8e
--- /dev/null
+++ b/tools/perf/util/aslr.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_ASLR_H
+#define __PERF_ASLR_H
+
+#include <linux/perf_event.h>
+
+#define ASLR_SUPPORTED_SAMPLE_TYPE ( \
+	PERF_SAMPLE_IDENTIFIER | \
+	PERF_SAMPLE_IP | \
+	PERF_SAMPLE_TID | \
+	PERF_SAMPLE_TIME | \
+	PERF_SAMPLE_ADDR | \
+	PERF_SAMPLE_ID | \
+	PERF_SAMPLE_STREAM_ID | \
+	PERF_SAMPLE_CPU | \
+	PERF_SAMPLE_PERIOD | \
+	PERF_SAMPLE_READ | \
+	PERF_SAMPLE_CALLCHAIN | \
+	PERF_SAMPLE_RAW | \
+	PERF_SAMPLE_BRANCH_STACK | \
+	PERF_SAMPLE_STACK_USER | \
+	PERF_SAMPLE_WEIGHT_TYPE | \
+	PERF_SAMPLE_DATA_SRC | \
+	PERF_SAMPLE_TRANSACTION | \
+	PERF_SAMPLE_PHYS_ADDR | \
+	PERF_SAMPLE_CGROUP | \
+	PERF_SAMPLE_DATA_PAGE_SIZE | \
+	PERF_SAMPLE_CODE_PAGE_SIZE | \
+	PERF_SAMPLE_AUX)
+
+struct perf_tool;
+struct evsel;
+struct evlist;
+union perf_event;
+
+struct perf_tool *aslr_tool__new(struct perf_tool *delegate);
+void aslr_tool__delete(struct perf_tool *tool);
+
+void aslr_tool__strip_attr_event(union perf_event *event, struct evlist *evlist);
+int aslr_tool__cache_orig_attrs(struct perf_tool *tool, struct evsel *evsel);
+void aslr_tool__strip_evlist(const struct perf_tool *tool, struct evlist *evlist);
+void aslr_tool__restore_evlist(const struct perf_tool *tool, struct evlist *evlist);
+
+#endif /* __PERF_ASLR_H */