qcacld-3.0: Avoid allocating large chunk of memory statically

Currently in wlan_is_nan_allowed_on_6ghz_freq and
__wlan_hdd_sysfs_freq_show static allocation of 6 GHz
channel list is present which leads to stack overflow.

To address this issue allocate 6 GHz channel list
dynamically.

Change-Id: If363270ab51516b67c68399f805a0434ccbb5bd3
CRs-Fixed: 3557442

components/nan/core/src/nan_api.c

@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2016-2021 The Linux Foundation. All rights reserved.
- * Copyright (c) 2021-2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2021-2023 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -415,8 +415,15 @@ static bool
 wlan_is_nan_allowed_on_6ghz_freq(struct wlan_objmgr_pdev *pdev, uint32_t freq)
 {
 	QDF_STATUS status;
-	struct regulatory_channel chan_list[NUM_6GHZ_CHANNELS];
+	struct regulatory_channel *chan_list;
+	uint32_t len_6g =
+			NUM_6GHZ_CHANNELS * sizeof(struct regulatory_channel);
 	uint16_t i;
+	bool ret = false;
+
+	chan_list = qdf_mem_malloc(len_6g);
+	if (!chan_list)
+		return ret;
 
 	status = wlan_reg_get_6g_ap_master_chan_list(pdev,
 						     REG_VERY_LOW_POWER_AP,
@@ -424,11 +431,15 @@ wlan_is_nan_allowed_on_6ghz_freq(struct wlan_objmgr_pdev *pdev, uint32_t freq)
 
 	for (i = 0; i < NUM_6GHZ_CHANNELS; i++) {
 		if ((freq == chan_list[i].center_freq) &&
-		    (chan_list[i].state == CHANNEL_STATE_ENABLE))
-			return true;
+		    (chan_list[i].state == CHANNEL_STATE_ENABLE)) {
+			ret = true;
+			goto end;
+		}
 	}
 
-	return false;
+end:
+	qdf_mem_free(chan_list);
+	return ret;
 }
 
 bool wlan_is_nan_allowed_on_freq(struct wlan_objmgr_pdev *pdev, uint32_t freq)

core/hdd/src/wlan_hdd_sysfs_get_freq_for_pwr.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -97,7 +97,9 @@ __wlan_hdd_sysfs_freq_show(struct hdd_context *hdd_ctx,
 			   struct kobj_attribute *attr, char *buf)
 {
 	int ret = 0;
-	struct regulatory_channel chan_list[NUM_6GHZ_CHANNELS];
+	struct regulatory_channel *chan_list;
+	uint32_t len_6g =
+			NUM_6GHZ_CHANNELS * sizeof(struct regulatory_channel);
 	QDF_STATUS status;
 	uint32_t i;
 
@@ -114,6 +116,10 @@ __wlan_hdd_sysfs_freq_show(struct hdd_context *hdd_ctx,
 	if (!strcmp(wlan_reg_get_power_string(hdd_ctx->power_type), "INVALID"))
 		return -EINVAL;
 
+	chan_list = qdf_mem_malloc(len_6g);
+	if (!chan_list)
+		return -ENOMEM;
+
 	status = wlan_reg_get_6g_ap_master_chan_list(
 						hdd_ctx->pdev,
 						hdd_ctx->power_type,
@@ -123,11 +129,14 @@ __wlan_hdd_sysfs_freq_show(struct hdd_context *hdd_ctx,
 		if ((chan_list[i].state != CHANNEL_STATE_DISABLE) &&
 		    !(chan_list[i].chan_flags & REGULATORY_CHAN_DISABLED)) {
 			if ((PAGE_SIZE - ret) <= 0)
-				return ret;
+				goto err;
 			ret += scnprintf(buf + ret, PAGE_SIZE - ret,
 					"%d  ", chan_list[i].center_freq);
 		}
 	}
+
+err:
+	qdf_mem_free(chan_list);
 	return ret;
 }