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, 93 insertions, 0 deletions

diff --git a/include/sound/cs-amp-lib.h b/include/sound/cs-amp-lib.h
new file mode 100644
index 000000000..e9aa86d76
--- /dev/null
+++ b/include/sound/cs-amp-lib.h
@@ -0,0 +1,93 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2024 Cirrus Logic, Inc. and
+ *                    Cirrus Logic International Semiconductor Ltd.
+ */
+
+#ifndef CS_AMP_LIB_H
+#define CS_AMP_LIB_H
+
+#include <linux/efi.h>
+#include <linux/types.h>
+
+struct cs_dsp;
+
+struct cirrus_amp_cal_data {
+	u32 calTarget[2];
+	u32 calTime[2];
+	s8  calAmbient;
+	u8  calStatus;
+	u16 calR;
+} __packed;
+
+struct cirrus_amp_efi_data {
+	u32 size;
+	u32 count;
+	struct cirrus_amp_cal_data data[] __counted_by(count);
+} __packed;
+
+/**
+ * struct cirrus_amp_cal_controls - definition of firmware calibration controls
+ * @alg_id:	ID of algorithm containing the controls.
+ * @mem_region:	DSP memory region containing the controls.
+ * @ambient:	Name of control for calAmbient value.
+ * @calr:	Name of control for calR value.
+ * @status:	Name of control for calStatus value.
+ * @checksum:	Name of control for checksum value.
+ */
+struct cirrus_amp_cal_controls {
+	unsigned int alg_id;
+	int mem_region;
+	const char *ambient;
+	const char *calr;
+	const char *status;
+	const char *checksum;
+};
+
+int cs_amp_write_cal_coeffs(struct cs_dsp *dsp,
+			    const struct cirrus_amp_cal_controls *controls,
+			    const struct cirrus_amp_cal_data *data);
+int cs_amp_read_cal_coeffs(struct cs_dsp *dsp,
+			   const struct cirrus_amp_cal_controls *controls,
+			   struct cirrus_amp_cal_data *data);
+int cs_amp_write_ambient_temp(struct cs_dsp *dsp,
+			      const struct cirrus_amp_cal_controls *controls,
+			      u32 temp);
+int cs_amp_get_efi_calibration_data(struct device *dev, u64 target_uid, int amp_index,
+				    struct cirrus_amp_cal_data *out_data);
+int cs_amp_set_efi_calibration_data(struct device *dev, int amp_index, int num_amps,
+				    const struct cirrus_amp_cal_data *in_data);
+int cs_amp_get_vendor_spkid(struct device *dev);
+const char *cs_amp_devm_get_vendor_specific_variant_id(struct device *dev,
+						       int ssid_vendor,
+						       int ssid_device);
+struct dentry *cs_amp_create_debugfs(struct device *dev);
+
+static inline u64 cs_amp_cal_target_u64(const struct cirrus_amp_cal_data *data)
+{
+	return ((u64)data->calTarget[1] << 32) | data->calTarget[0];
+}
+
+struct cs_amp_test_hooks {
+	efi_status_t (*get_efi_variable)(efi_char16_t *name,
+					 efi_guid_t *guid,
+					 u32 *returned_attr,
+					 unsigned long *size,
+					 void *buf);
+	efi_status_t (*set_efi_variable)(efi_char16_t *name,
+					 efi_guid_t *guid,
+					 u32 attr,
+					 unsigned long size,
+					 void *buf);
+
+	int (*write_cal_coeff)(struct cs_dsp *dsp,
+			       const struct cirrus_amp_cal_controls *controls,
+			       const char *ctl_name, u32 val);
+
+	int (*read_cal_coeff)(struct cs_dsp *dsp,
+			      const struct cirrus_amp_cal_controls *controls,
+			      const char *ctl_name, u32 *val);
+};
+extern const struct cs_amp_test_hooks * const cs_amp_test_hooks;
+
+#endif /* CS_AMP_LIB_H */