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, 65 insertions, 0 deletions

diff --git a/drivers/tty/vt/Makefile b/drivers/tty/vt/Makefile
new file mode 100644
index 000000000..ae746dcde
--- /dev/null
+++ b/drivers/tty/vt/Makefile
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# This file contains the font map for the default (hardware) font
+#
+FONTMAPFILE = cp437.uni
+
+obj-$(CONFIG_VT)			+= vt_ioctl.o vc_screen.o \
+					   selection.o keyboard.o \
+					   vt.o defkeymap.o
+obj-$(CONFIG_CONSOLE_TRANSLATIONS)	+= consolemap.o consolemap_deftbl.o \
+					   ucs.o
+
+# Files generated that shall be removed upon make clean
+clean-files :=	consolemap_deftbl.c defkeymap.c \
+		ucs_width_table.h ucs_recompose_table.h ucs_fallback_table.h
+
+hostprogs += conmakehash
+
+quiet_cmd_conmk = CONMK   $@
+      cmd_conmk = $(obj)/conmakehash $< > $@
+
+$(obj)/consolemap_deftbl.c: $(src)/$(FONTMAPFILE) $(obj)/conmakehash
+	$(call cmd,conmk)
+
+$(obj)/defkeymap.o:  $(obj)/defkeymap.c
+
+# Uncomment if you're changing the keymap and have an appropriate
+# loadkeys version for the map. By default, we'll use the shipped
+# versions.
+# GENERATE_KEYMAP := 1
+
+ifdef GENERATE_KEYMAP
+
+$(obj)/defkeymap.c: $(obj)/%.c: $(src)/%.map
+	loadkeys --mktable --unicode $< > $@
+
+endif
+
+$(obj)/ucs.o:	$(src)/ucs.c $(obj)/ucs_width_table.h \
+		$(obj)/ucs_recompose_table.h $(obj)/ucs_fallback_table.h
+
+# You may uncomment one of those to have the UCS tables be regenerated
+# during the build process. By default the _shipped versions are used.
+#
+#GENERATE_UCS_TABLES := 1
+#GENERATE_UCS_TABLES := 2  # invokes gen_ucs_recompose_table.py with --full
+
+ifdef GENERATE_UCS_TABLES
+
+$(obj)/ucs_width_table.h: $(src)/gen_ucs_width_table.py
+	$(PYTHON3) $< -o $@
+
+ifeq ($(GENERATE_UCS_TABLES),2)
+gen_recomp_arg := --full
+else
+gen_recomp_arg :=
+endif
+
+$(obj)/ucs_recompose_table.h: $(src)/gen_ucs_recompose_table.py
+	$(PYTHON3) $< -o $@ $(gen_recomp_arg)
+
+$(obj)/ucs_fallback_table.h: $(src)/gen_ucs_fallback_table.py
+	$(PYTHON3) $< -o $@
+
+endif