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, 40 insertions, 0 deletions

diff --git a/include/rdma/frmr_pools.h b/include/rdma/frmr_pools.h
new file mode 100644
index 000000000..aed4d69d3
--- /dev/null
+++ b/include/rdma/frmr_pools.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
+ *
+ * Copyright (c) 2025, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ */
+
+#ifndef FRMR_POOLS_H
+#define FRMR_POOLS_H
+
+#include <linux/types.h>
+#include <asm/page.h>
+
+struct ib_device;
+struct ib_mr;
+
+struct ib_frmr_key {
+	u64 vendor_key;
+	/* A pool with non-zero kernel_vendor_key is a kernel-only pool. */
+	u64 kernel_vendor_key;
+	size_t num_dma_blocks;
+	int access_flags;
+	u8 ats:1;
+};
+
+struct ib_frmr_pool_ops {
+	int (*create_frmrs)(struct ib_device *device, struct ib_frmr_key *key,
+			    u32 *handles, u32 count);
+	void (*destroy_frmrs)(struct ib_device *device, u32 *handles,
+			      u32 count);
+	int (*build_key)(struct ib_device *device, const struct ib_frmr_key *in,
+			 struct ib_frmr_key *out);
+};
+
+int ib_frmr_pools_init(struct ib_device *device,
+		       const struct ib_frmr_pool_ops *pool_ops);
+void ib_frmr_pools_cleanup(struct ib_device *device);
+int ib_frmr_pool_pop(struct ib_device *device, struct ib_mr *mr);
+void ib_frmr_pool_push(struct ib_device *device, struct ib_mr *mr);
+void ib_frmr_pool_drop(struct ib_mr *mr);
+
+#endif /* FRMR_POOLS_H */