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, 100 insertions, 0 deletions

diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
new file mode 100644
index 000000000..ab74b5ed0
--- /dev/null
+++ b/include/net/netns/conntrack.h
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NETNS_CONNTRACK_H
+#define __NETNS_CONNTRACK_H
+
+#include <linux/list.h>
+#include <linux/list_nulls.h>
+#include <linux/atomic.h>
+#include <linux/workqueue.h>
+#include <linux/netfilter/nf_conntrack_tcp.h>
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+#include <linux/netfilter/nf_conntrack_sctp.h>
+#endif
+#include <linux/seqlock.h>
+
+struct ctl_table_header;
+struct nf_conntrack_ecache;
+
+struct nf_generic_net {
+	unsigned int timeout;
+};
+
+struct nf_tcp_net {
+	unsigned int timeouts[TCP_CONNTRACK_TIMEOUT_MAX];
+	u8 tcp_loose;
+	u8 tcp_be_liberal;
+	u8 tcp_max_retrans;
+	u8 tcp_ignore_invalid_rst;
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+	unsigned int offload_timeout;
+#endif
+};
+
+enum udp_conntrack {
+	UDP_CT_UNREPLIED,
+	UDP_CT_REPLIED,
+	UDP_CT_MAX
+};
+
+struct nf_udp_net {
+	unsigned int timeouts[UDP_CT_MAX];
+#if IS_ENABLED(CONFIG_NF_FLOW_TABLE)
+	unsigned int offload_timeout;
+#endif
+};
+
+struct nf_icmp_net {
+	unsigned int timeout;
+};
+
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+struct nf_sctp_net {
+	unsigned int timeouts[SCTP_CONNTRACK_MAX];
+};
+#endif
+
+#ifdef CONFIG_NF_CT_PROTO_GRE
+enum gre_conntrack {
+	GRE_CT_UNREPLIED,
+	GRE_CT_REPLIED,
+	GRE_CT_MAX
+};
+
+struct nf_gre_net {
+	struct list_head	keymap_list;
+	unsigned int		timeouts[GRE_CT_MAX];
+};
+#endif
+
+struct nf_ip_net {
+	struct nf_generic_net   generic;
+	struct nf_tcp_net	tcp;
+	struct nf_udp_net	udp;
+	struct nf_icmp_net	icmp;
+	struct nf_icmp_net	icmpv6;
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+	struct nf_sctp_net	sctp;
+#endif
+#ifdef CONFIG_NF_CT_PROTO_GRE
+	struct nf_gre_net	gre;
+#endif
+};
+
+struct netns_ct {
+#ifdef CONFIG_NF_CONNTRACK_EVENTS
+	bool ecache_dwork_pending;
+#endif
+	u8			sysctl_log_invalid; /* Log invalid packets */
+	u8			sysctl_events;
+	u8			sysctl_acct;
+	u8			sysctl_tstamp;
+	u8			sysctl_checksum;
+
+	struct ip_conntrack_stat __percpu *stat;
+	struct nf_ct_event_notifier __rcu *nf_conntrack_event_cb;
+	struct nf_ip_net	nf_ct_proto;
+#if defined(CONFIG_NF_CONNTRACK_LABELS)
+	atomic_t		labels_used;
+#endif
+};
+#endif