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/net/wan/Makefile b/drivers/net/wan/Makefile
new file mode 100644
index 000000000..00e9b7ee1
--- /dev/null
+++ b/drivers/net/wan/Makefile
@@ -0,0 +1,65 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux network (wan) device drivers.
+#
+# 3 Aug 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+#
+
+obj-$(CONFIG_HDLC)		+= hdlc.o
+obj-$(CONFIG_HDLC_RAW)		+= hdlc_raw.o
+obj-$(CONFIG_HDLC_RAW_ETH)	+= hdlc_raw_eth.o
+obj-$(CONFIG_HDLC_CISCO)	+= hdlc_cisco.o
+obj-$(CONFIG_HDLC_FR)		+= hdlc_fr.o
+obj-$(CONFIG_HDLC_PPP)		+= hdlc_ppp.o
+obj-$(CONFIG_HDLC_X25)		+= hdlc_x25.o
+
+obj-y				+= framer/
+
+obj-$(CONFIG_FARSYNC)		+= farsync.o
+
+obj-$(CONFIG_LAPBETHER)		+= lapbether.o
+obj-$(CONFIG_N2)		+= n2.o
+obj-$(CONFIG_C101)		+= c101.o
+obj-$(CONFIG_WANXL)		+= wanxl.o
+obj-$(CONFIG_PCI200SYN)		+= pci200syn.o
+obj-$(CONFIG_PC300TOO)		+= pc300too.o
+obj-$(CONFIG_IXP4XX_HSS)	+= ixp4xx_hss.o
+obj-$(CONFIG_FSL_QMC_HDLC)	+= fsl_qmc_hdlc.o
+obj-$(CONFIG_FSL_UCC_HDLC)	+= fsl_ucc_hdlc.o
+obj-$(CONFIG_SLIC_DS26522)	+= slic_ds26522.o
+
+clean-files := wanxlfw.inc
+$(obj)/wanxl.o:	$(obj)/wanxlfw.inc
+
+CROSS_COMPILE_M68K = m68k-linux-gnu-
+
+ifeq ($(CONFIG_WANXL_BUILD_FIRMWARE),y)
+ifeq ($(ARCH),m68k)
+  M68KCC = $(CC)
+  M68KLD = $(LD)
+else
+  M68KCC = $(CROSS_COMPILE_M68K)gcc
+  M68KLD = $(CROSS_COMPILE_M68K)ld
+endif
+
+quiet_cmd_build_wanxlfw = BLDFW   $@
+      cmd_build_wanxlfw = hexdump -ve '"\n" 16/1 "0x%02X,"' $< | \
+	sed 's/0x  ,//g;1s/^/static const u8 firmware[]={/;$$s/,$$/\n};\n/' > $@
+
+$(obj)/wanxlfw.inc: $(obj)/wanxlfw.bin FORCE
+	$(call if_changed,build_wanxlfw)
+
+quiet_cmd_m68kld_bin_o = M68KLD  $@
+      cmd_m68kld_bin_o = $(M68KLD) --oformat binary -Ttext 0x1000 $< -o $@
+
+$(obj)/wanxlfw.bin: $(obj)/wanxlfw.o FORCE
+	$(call if_changed,m68kld_bin_o)
+
+quiet_cmd_m68kas_o_S = M68KAS  $@
+      cmd_m68kas_o_S = $(M68KCC) -D__ASSEMBLY__ -Wp,-MD,$(depfile) -I$(srctree)/include/uapi -c -o $@ $<
+
+$(obj)/wanxlfw.o: $(src)/wanxlfw.S FORCE
+	$(call if_changed_dep,m68kas_o_S)
+endif
+targets += wanxlfw.inc wanxlfw.bin wanxlfw.o