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, 161 insertions, 0 deletions

diff --git a/net/devlink/sh_dev.c b/net/devlink/sh_dev.c
new file mode 100644
index 000000000..85acce97e
--- /dev/null
+++ b/net/devlink/sh_dev.c
@@ -0,0 +1,161 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES. All rights reserved. */
+
+#include <net/devlink.h>
+
+#include "devl_internal.h"
+
+static LIST_HEAD(shd_list);
+static DEFINE_MUTEX(shd_mutex); /* Protects shd_list and shd->list */
+
+/* This structure represents a shared devlink instance,
+ * there is one created per identifier (e.g., serial number).
+ */
+struct devlink_shd {
+	struct list_head list; /* Node in shd list */
+	const char *id; /* Identifier string (e.g., serial number) */
+	refcount_t refcount; /* Reference count */
+	size_t priv_size; /* Size of driver private data */
+	char priv[] __aligned(NETDEV_ALIGN) __counted_by(priv_size);
+};
+
+static struct devlink_shd *devlink_shd_lookup(const char *id)
+{
+	struct devlink_shd *shd;
+
+	list_for_each_entry(shd, &shd_list, list) {
+		if (!strcmp(shd->id, id))
+			return shd;
+	}
+
+	return NULL;
+}
+
+static struct devlink_shd *devlink_shd_create(const char *id,
+					      const struct devlink_ops *ops,
+					      size_t priv_size,
+					      const struct device_driver *driver)
+{
+	struct devlink_shd *shd;
+	struct devlink *devlink;
+
+	devlink = __devlink_alloc(ops, sizeof(struct devlink_shd) + priv_size,
+				  &init_net, NULL, driver);
+	if (!devlink)
+		return NULL;
+	shd = devlink_priv(devlink);
+
+	shd->id = kstrdup(id, GFP_KERNEL);
+	if (!shd->id)
+		goto err_devlink_free;
+	shd->priv_size = priv_size;
+	refcount_set(&shd->refcount, 1);
+
+	devl_lock(devlink);
+	devl_register(devlink);
+	devl_unlock(devlink);
+
+	list_add_tail(&shd->list, &shd_list);
+
+	return shd;
+
+err_devlink_free:
+	devlink_free(devlink);
+	return NULL;
+}
+
+static void devlink_shd_destroy(struct devlink_shd *shd)
+{
+	struct devlink *devlink = priv_to_devlink(shd);
+
+	list_del(&shd->list);
+	devl_lock(devlink);
+	devl_unregister(devlink);
+	devl_unlock(devlink);
+	kfree(shd->id);
+	devlink_free(devlink);
+}
+
+/**
+ * devlink_shd_get - Get or create a shared devlink instance
+ * @id: Identifier string (e.g., serial number) for the shared instance
+ * @ops: Devlink operations structure
+ * @priv_size: Size of private data structure
+ * @driver: Driver associated with the shared devlink instance
+ *
+ * Get an existing shared devlink instance identified by @id, or create
+ * a new one if it doesn't exist. Return the devlink instance with a
+ * reference held. The caller must call devlink_shd_put() when done.
+ *
+ * All callers sharing the same @id must pass identical @ops, @priv_size
+ * and @driver. A mismatch triggers a warning and returns NULL.
+ *
+ * Return: Pointer to the shared devlink instance on success,
+ *         NULL on failure
+ */
+struct devlink *devlink_shd_get(const char *id,
+				const struct devlink_ops *ops,
+				size_t priv_size,
+				const struct device_driver *driver)
+{
+	struct devlink *devlink;
+	struct devlink_shd *shd;
+
+	mutex_lock(&shd_mutex);
+
+	shd = devlink_shd_lookup(id);
+	if (!shd) {
+		shd = devlink_shd_create(id, ops, priv_size, driver);
+		goto unlock;
+	}
+
+	devlink = priv_to_devlink(shd);
+	if (WARN_ON_ONCE(devlink->ops != ops ||
+			 shd->priv_size != priv_size ||
+			 devlink->dev_driver != driver)) {
+		shd = NULL;
+		goto unlock;
+	}
+	refcount_inc(&shd->refcount);
+
+unlock:
+	mutex_unlock(&shd_mutex);
+	return shd ? priv_to_devlink(shd) : NULL;
+}
+EXPORT_SYMBOL_GPL(devlink_shd_get);
+
+/**
+ * devlink_shd_put - Release a reference on a shared devlink instance
+ * @devlink: Shared devlink instance
+ *
+ * Release a reference on a shared devlink instance obtained via
+ * devlink_shd_get().
+ */
+void devlink_shd_put(struct devlink *devlink)
+{
+	struct devlink_shd *shd;
+
+	mutex_lock(&shd_mutex);
+	shd = devlink_priv(devlink);
+	if (refcount_dec_and_test(&shd->refcount))
+		devlink_shd_destroy(shd);
+	mutex_unlock(&shd_mutex);
+}
+EXPORT_SYMBOL_GPL(devlink_shd_put);
+
+/**
+ * devlink_shd_get_priv - Get private data from shared devlink instance
+ * @devlink: Devlink instance
+ *
+ * Returns a pointer to the driver's private data structure within
+ * the shared devlink instance.
+ *
+ * Return: Pointer to private data
+ */
+void *devlink_shd_get_priv(struct devlink *devlink)
+{
+	struct devlink_shd *shd = devlink_priv(devlink);
+
+	return shd->priv;
+}
+EXPORT_SYMBOL_GPL(devlink_shd_get_priv);