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, 37 insertions, 0 deletions

diff --git a/net/bridge/Makefile b/net/bridge/Makefile
new file mode 100644
index 000000000..1203dc19e
--- /dev/null
+++ b/net/bridge/Makefile
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the IEEE 802.1d ethernet bridging layer.
+#
+
+obj-$(CONFIG_BRIDGE) += bridge.o
+
+bridge-y	:= br.o br_device.o br_fdb.o br_forward.o br_if.o br_input.o \
+			br_ioctl.o br_stp.o br_stp_bpdu.o \
+			br_stp_if.o br_stp_timer.o br_netlink.o \
+			br_netlink_tunnel.o br_arp_nd_proxy.o
+
+bridge-$(CONFIG_SYSFS) += br_sysfs_if.o br_sysfs_br.o
+
+bridge-$(subst m,y,$(CONFIG_BRIDGE_NETFILTER)) += br_nf_core.o
+
+br_netfilter-y := br_netfilter_hooks.o
+br_netfilter-$(subst m,y,$(CONFIG_IPV6)) += br_netfilter_ipv6.o
+obj-$(CONFIG_BRIDGE_NETFILTER) += br_netfilter.o
+
+bridge-$(CONFIG_BRIDGE_IGMP_SNOOPING) += br_multicast.o br_mdb.o br_multicast_eht.o
+
+bridge-$(CONFIG_BRIDGE_VLAN_FILTERING) += br_vlan.o br_vlan_tunnel.o br_vlan_options.o br_mst.o
+
+bridge-$(CONFIG_NET_SWITCHDEV) += br_switchdev.o
+
+obj-$(CONFIG_NETFILTER) += netfilter/
+
+bridge-$(CONFIG_BRIDGE_MRP)	+= br_mrp_switchdev.o br_mrp.o br_mrp_netlink.o
+
+bridge-$(CONFIG_BRIDGE_CFM)	+= br_cfm.o br_cfm_netlink.o
+
+ifdef CONFIG_GCOV_PROFILE_NETFILTER
+GCOV_PROFILE_br_nf_core.o := y
+GCOV_PROFILE_br_netfilter_hooks.o := y
+GCOV_PROFILE_br_netfilter_ipv6.o := y
+endif