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, 30 insertions, 0 deletions

diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
new file mode 100644
index 000000000..b2e4ba6a4
--- /dev/null
+++ b/drivers/usb/cdns3/Makefile
@@ -0,0 +1,30 @@
+# SPDX-License-Identifier: GPL-2.0
+# define_trace.h needs to know how to find our header
+CFLAGS_cdns3-trace.o				:= -I$(src)
+CFLAGS_cdnsp-trace.o				:= -I$(src)
+
+obj-$(CONFIG_USB_CDNS3)			+= cdns.o
+
+cdns-y					:= core.o drd.o cdns3-plat.o
+cdns-$(CONFIG_USB_CDNS3_HOST)		+= host.o
+
+ifneq ($(CONFIG_USB_CDNS3_GADGET),)
+cdns-y					+= cdns3-gadget.o cdns3-ep0.o \
+					   cdnsp-ring.o cdnsp-gadget.o \
+					   cdnsp-mem.o cdnsp-ep0.o
+endif
+
+ifneq ($(CONFIG_TRACING),)
+ifneq ($(CONFIG_USB_CDNS3_GADGET),)
+cdns-y					+= cdns3-trace.o cdnsp-trace.o
+endif
+endif
+
+##
+# Platform-specific glue layers (PCI wrappers, SoC integration)
+##
+obj-$(CONFIG_USB_CDNS3_PCI_WRAP)		+= cdns3-pci-wrap.o
+obj-$(CONFIG_USB_CDNSP_PCI)			+= cdnsp-pci.o
+obj-$(CONFIG_USB_CDNS3_TI)			+= cdns3-ti.o
+obj-$(CONFIG_USB_CDNS3_IMX)			+= cdns3-imx.o
+obj-$(CONFIG_USB_CDNS3_STARFIVE)		+= cdns3-starfive.o