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, 62 insertions, 0 deletions

diff --git a/tools/docs/find-unused-docs.sh b/tools/docs/find-unused-docs.sh
new file mode 100755
index 000000000..53514c759
--- /dev/null
+++ b/tools/docs/find-unused-docs.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+# (c) 2017, Jonathan Corbet <corbet@lwn.net>
+#           sayli karnik <karniksayli1995@gmail.com>
+#
+# This script detects files with kernel-doc comments for exported functions
+# that are not included in documentation.
+#
+# usage: Run 'tools/docs/find-unused-docs.sh directory' from top level of kernel
+# 	 tree.
+#
+# example: $tools/docs/find-unused-docs.sh drivers/scsi
+#
+# Licensed under the terms of the GNU GPL License
+
+if ! [ -d "Documentation" ]; then
+	echo "Run from top level of kernel tree"
+	exit 1
+fi
+
+if [ "$#" -ne 1 ]; then
+	echo "Usage: tools/docs/find-unused-docs.sh directory"
+	exit 1
+fi
+
+if ! [ -d "$1" ]; then
+	echo "Directory $1 doesn't exist"
+	exit 1
+fi
+
+cd "$( dirname "${BASH_SOURCE[0]}" )"
+cd ../..
+
+cd Documentation/
+
+echo "The following files contain kerneldoc comments for exported functions \
+that are not used in the formatted documentation"
+
+# FILES INCLUDED
+
+files_included=($(grep -rHR ".. kernel-doc" --include \*.rst | cut -d " " -f 3))
+
+declare -A FILES_INCLUDED
+
+for each in "${files_included[@]}"; do
+	FILES_INCLUDED[$each]="$each"
+	done
+
+cd ..
+
+# FILES NOT INCLUDED
+
+for file in `find $1 -name '*.c'`; do
+
+	if [[ ${FILES_INCLUDED[$file]+_} ]]; then
+	continue;
+	fi
+	str=$(PYTHONDONTWRITEBYTECODE=1 tools/docs/kernel-doc -export "$file" 2>/dev/null)
+	if [[ -n "$str" ]]; then
+	echo "$file"
+	fi
+	done
+