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, 51 insertions, 0 deletions

diff --git a/include/video/cvisionppc.h b/include/video/cvisionppc.h
new file mode 100644
index 000000000..11250eee9
--- /dev/null
+++ b/include/video/cvisionppc.h
@@ -0,0 +1,51 @@
+/*
+ * Phase5 CybervisionPPC (TVP4020) definitions for the Permedia2 framebuffer
+ * driver.
+ *
+ * Copyright (c) 1998-1999 Ilario Nardinocchi (nardinoc@CS.UniBO.IT)
+ * --------------------------------------------------------------------------
+ * $Id: cvisionppc.h,v 1.8 1999/01/28 13:18:07 illo Exp $
+ * --------------------------------------------------------------------------
+ * 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.
+ */
+
+#ifndef CVISIONPPC_H
+#define CVISIONPPC_H
+
+#ifndef PM2FB_H
+#include "pm2fb.h"
+#endif
+
+struct cvppc_par {
+	unsigned char* pci_config;
+	unsigned char* pci_bridge;
+	u32 user_flags;
+};
+
+#define CSPPC_PCI_BRIDGE		0xfffe0000
+#define CSPPC_BRIDGE_ENDIAN		0x0000
+#define CSPPC_BRIDGE_INT		0x0010
+
+#define	CVPPC_PCI_CONFIG		0xfffc0000
+#define CVPPC_ROM_ADDRESS		0xe2000001
+#define CVPPC_REGS_REGION		0xef000000
+#define CVPPC_FB_APERTURE_ONE		0xe0000000
+#define CVPPC_FB_APERTURE_TWO		0xe1000000
+#define CVPPC_FB_SIZE			0x00800000
+#define CVPPC_MEM_CONFIG_OLD		0xed61fcaa	/* FIXME Fujitsu?? */
+#define CVPPC_MEM_CONFIG_NEW		0xed41c532	/* FIXME USA?? */
+#define CVPPC_MEMCLOCK			83000		/* in KHz */
+
+/* CVPPC_BRIDGE_ENDIAN */
+#define CSPPCF_BRIDGE_BIG_ENDIAN	0x02
+
+/* CVPPC_BRIDGE_INT */
+#define CSPPCF_BRIDGE_ACTIVE_INT2	0x01
+
+#endif	/* CVISIONPPC_H */
+
+/*****************************************************************************
+ * That's all folks!
+ *****************************************************************************/