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, 120 insertions, 0 deletions

diff --git a/arch/alpha/boot/Makefile b/arch/alpha/boot/Makefile
new file mode 100644
index 000000000..d8dba85e6
--- /dev/null
+++ b/arch/alpha/boot/Makefile
@@ -0,0 +1,120 @@
+#
+# arch/alpha/boot/Makefile
+#
+# 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.
+#
+# Copyright (C) 1994 by Linus Torvalds
+#
+
+hostprogs	:= tools/mkbb tools/objstrip
+targets		:= vmlinux.gz vmlinux \
+		   vmlinux.nh tools/lxboot tools/bootlx tools/bootph \
+		   tools/bootpzh bootloader bootpheader bootpzheader 
+OBJSTRIP	:= $(obj)/tools/objstrip
+
+KBUILD_HOSTCFLAGS := -Wall -I$(objtree)/usr/include
+BOOTCFLAGS	+= -I$(objtree)/$(obj) -I$(srctree)/$(obj)
+
+# SRM bootable image.  Copy to offset 512 of a partition.
+$(obj)/bootimage: $(addprefix $(obj)/tools/,mkbb lxboot bootlx) $(obj)/vmlinux.nh
+	( cat $(obj)/tools/lxboot $(obj)/tools/bootlx $(obj)/vmlinux.nh ) > $@ 
+	$(obj)/tools/mkbb $@ $(obj)/tools/lxboot
+	@echo '  Bootimage $@ is ready'
+
+# BOOTP bootable image.  Define INITRD during make to append initrd image.
+$(obj)/bootpfile: $(obj)/tools/bootph $(obj)/vmlinux.nh
+	cat $(obj)/tools/bootph $(obj)/vmlinux.nh > $@
+ifdef INITRD
+	cat $(INITRD) >> $@
+endif
+
+# Compressed kernel BOOTP bootable image.
+# Define INITRD during make to append initrd image.
+$(obj)/bootpzfile: $(obj)/tools/bootpzh $(obj)/vmlinux.nh.gz
+	cat $(obj)/tools/bootpzh $(obj)/vmlinux.nh.gz > $@
+ifdef INITRD
+	cat $(INITRD) >> $@
+endif
+
+# Compressed kernel image
+$(obj)/vmlinux.gz: $(obj)/vmlinux FORCE
+	$(call if_changed,gzip)
+	@echo '  Kernel $@ is ready'
+
+$(obj)/main.o: $(obj)/ksize.h
+$(obj)/bootp.o: $(obj)/ksize.h
+$(obj)/bootpz.o: $(obj)/kzsize.h
+
+$(obj)/ksize.h: $(obj)/vmlinux.nh FORCE
+	echo "#define KERNEL_SIZE `ls -l $(obj)/vmlinux.nh | awk '{print $$5}'`" > $@T
+ifdef INITRD
+	[ -f $(INITRD) ] || exit 1
+	echo "#define INITRD_IMAGE_SIZE `ls -l $(INITRD) | awk '{print $$5}'`" >> $@T
+endif
+	cmp -s $@T $@ || mv -f $@T $@
+	rm -f $@T
+
+$(obj)/kzsize.h: $(obj)/vmlinux.nh.gz FORCE
+	echo "#define KERNEL_SIZE `ls -l $(obj)/vmlinux.nh | awk '{print $$5}'`" > $@T
+	echo "#define KERNEL_Z_SIZE `ls -l $(obj)/vmlinux.nh.gz | awk '{print $$5}'`" >> $@T
+ifdef INITRD
+	[ -f $(INITRD) ] || exit 1
+	echo "#define INITRD_IMAGE_SIZE `ls -l $(INITRD) | awk '{print $$5}'`" >> $@T
+endif
+	cmp -s $@T $@ || mv -f $@T $@
+	rm -f $@T
+
+quiet_cmd_strip = STRIP  $@
+      cmd_strip = $(STRIP) -o $@ $<
+
+$(obj)/vmlinux: vmlinux FORCE
+	$(call if_changed,strip)
+
+quiet_cmd_objstrip = OBJSTRIP $@
+      cmd_objstrip = $(OBJSTRIP) $(OSFLAGS_$(@F)) $< $@
+
+OSFLAGS_vmlinux.nh	:= -v
+OSFLAGS_lxboot		:= -p
+OSFLAGS_bootlx		:= -vb
+OSFLAGS_bootph		:= -vb
+OSFLAGS_bootpzh		:= -vb
+
+$(obj)/vmlinux.nh: vmlinux $(OBJSTRIP) FORCE
+	$(call if_changed,objstrip)
+
+$(obj)/vmlinux.nh.gz: $(obj)/vmlinux.nh FORCE
+	$(call if_changed,gzip)
+
+$(obj)/tools/lxboot: $(obj)/bootloader $(OBJSTRIP) FORCE
+	$(call if_changed,objstrip)
+
+$(obj)/tools/bootlx: $(obj)/bootloader $(OBJSTRIP) FORCE
+	$(call if_changed,objstrip)
+
+$(obj)/tools/bootph: $(obj)/bootpheader $(OBJSTRIP) FORCE
+	$(call if_changed,objstrip)
+
+$(obj)/tools/bootpzh: $(obj)/bootpzheader $(OBJSTRIP) FORCE
+	$(call if_changed,objstrip)
+
+LDFLAGS_bootloader   := -static -T # -N -relax
+LDFLAGS_bootloader   := -static -T # -N -relax
+LDFLAGS_bootpheader  := -static -T # -N -relax
+LDFLAGS_bootpzheader := -static -T # -N -relax
+
+OBJ_bootlx   := $(obj)/head.o $(obj)/stdio.o $(obj)/main.o
+OBJ_bootph   := $(obj)/head.o $(obj)/stdio.o $(obj)/bootp.o
+OBJ_bootpzh  := $(obj)/head.o $(obj)/stdio.o $(obj)/bootpz.o $(obj)/misc.o
+
+$(obj)/bootloader: $(obj)/bootloader.lds $(OBJ_bootlx) $(LIBS_Y) FORCE
+	$(call if_changed,ld)
+
+$(obj)/bootpheader: $(obj)/bootloader.lds $(OBJ_bootph) $(LIBS_Y) FORCE
+	$(call if_changed,ld)
+
+$(obj)/bootpzheader: $(obj)/bootloader.lds $(OBJ_bootpzh) $(LIBS_Y) FORCE
+	$(call if_changed,ld)
+
+$(obj)/misc.o: lib/inflate.c