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, 34 insertions, 0 deletions

diff --git a/drivers/gpib/common/ibsys.h b/drivers/gpib/common/ibsys.h
new file mode 100644
index 000000000..e5a148f51
--- /dev/null
+++ b/drivers/gpib/common/ibsys.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include "gpibP.h"
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/major.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/timer.h>
+
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+
+#define MAX_GPIB_PRIMARY_ADDRESS 30
+#define MAX_GPIB_SECONDARY_ADDRESS 31
+
+int gpib_allocate_board(struct gpib_board *board);
+void gpib_deallocate_board(struct gpib_board *board);
+
+unsigned int num_status_bytes(const struct gpib_status_queue *dev);
+int push_status_byte(struct gpib_board *board, struct gpib_status_queue *device,
+		     u8 poll_byte);
+int pop_status_byte(struct gpib_board *board, struct gpib_status_queue *device,
+		    u8 *poll_byte);
+struct gpib_status_queue *get_gpib_status_queue(struct gpib_board *board,
+						unsigned int pad, int sad);
+int get_serial_poll_byte(struct gpib_board *board, unsigned int pad, int sad,
+			 unsigned int usec_timeout, u8 *poll_byte);
+int autopoll_all_devices(struct gpib_board *board);