qcacld-3.0: Check NULL value of hdd_adapter_get_mac_handle()

The return of hdd_adapter_get_mac_handle() API can be NULL.
Check the NULL pointer before accessing.

Change-Id: Iad0c6be8932323442bc0080ea311092207bf32e6
CRs-Fixed: 3463354

core/hdd/src/wlan_hdd_apf.c

@@ -495,6 +495,13 @@ static int hdd_apf_read_memory(struct hdd_adapter *adapter, struct nlattr **tb)
 	int ret = 0;
 	struct sk_buff *skb = NULL;
 	uint8_t *bufptr;
+	mac_handle_t mac_handle;
+
+	mac_handle = hdd_adapter_get_mac_handle(adapter);
+	if (!mac_handle) {
+		hdd_debug("mac ctx NULL");
+		return -EINVAL;
+	}
 
 	if (context->apf_enabled) {
 		hdd_err("Cannot get/set while interpreter is enabled");
@@ -536,8 +543,7 @@ static int hdd_apf_read_memory(struct hdd_adapter *adapter, struct nlattr **tb)
 	context->buf_len = read_mem_params.length;
 	context->magic = APF_CONTEXT_MAGIC;
 
-	status = sme_apf_read_work_memory(hdd_adapter_get_mac_handle(adapter),
-					  &read_mem_params,
+	status = sme_apf_read_work_memory(mac_handle, &read_mem_params,
 					  hdd_apf_read_memory_callback);
 	if (QDF_IS_STATUS_ERROR(status)) {
 		hdd_err("Unable to post sme APF read memory message (status-%d)",

core/hdd/src/wlan_hdd_assoc.c

@@ -2137,12 +2137,16 @@ static void hdd_roam_channel_switch_handler(struct hdd_adapter *adapter,
 	struct hdd_chan_change_params chan_change;
 	QDF_STATUS status;
 	struct hdd_context *hdd_ctx = WLAN_HDD_GET_CTX(adapter);
-	mac_handle_t mac_handle = hdd_adapter_get_mac_handle(adapter);
+	mac_handle_t mac_handle;
 	struct hdd_station_ctx *sta_ctx;
 	uint8_t connected_vdev;
 	bool notify = true, is_sap_go_moved_before_sta = false;
 	struct wlan_objmgr_vdev *vdev;
 
+	mac_handle = hdd_adapter_get_mac_handle(adapter);
+	if (!mac_handle)
+		return;
+
 	/* Enable Roaming on STA interface which was disabled before CSA */
 	if (adapter->device_mode == QDF_STA_MODE)
 		sme_start_roaming(mac_handle, adapter->deflink->vdev_id,

core/hdd/src/wlan_hdd_main.c

@@ -19767,6 +19767,11 @@ int hdd_get_rssi_snr_by_bssid(struct hdd_adapter *adapter, const uint8_t *bssid,
 	mac_handle_t mac_handle;
 
 	mac_handle = hdd_adapter_get_mac_handle(adapter);
+	if (!mac_handle) {
+		hdd_err("mac context NULL");
+		return -EINVAL;
+	}
+
 	status = sme_get_rssi_snr_by_bssid(mac_handle, bssid, rssi, snr);
 	if (QDF_STATUS_SUCCESS != status) {
 		hdd_debug("sme_get_rssi_snr_by_bssid failed");

core/hdd/src/wlan_hdd_nan_datapath.c

@@ -306,6 +306,11 @@ static int hdd_ndi_start_bss(struct hdd_adapter *adapter)
 	hdd_enter();
 	hdd_ctx = WLAN_HDD_GET_CTX(adapter);
 
+	if (!mac) {
+		hdd_debug("mac ctx NULL");
+		return -EINVAL;
+	}
+
 	status = hdd_ndi_select_valid_freq(hdd_ctx, &valid_freq);
 	if (!QDF_IS_STATUS_SUCCESS(status)) {
 		hdd_err("Unable to retrieve channel list for NAN");