qcacld-3.0: Fix possible buffer overread in wma_set_epno_network_list

In the function wma_set_epno_network_list,
req->networks[i].ssid.ssId is copied into the destination
params->networks[i].ssid.mac_ssid. But the ssid length is not
considered while copying and WMI_MAC_MAX_SSID_LENGTH is used as
the length for copying. This might result in possible buffer
overread if the ssid length is not WMI_MAC_MAX_SSID_LENGTH.
Similar issue is seen in wma_pno_start also.

Use pno->aNetworks[i].ssId.length as the size to mem copy the
ssid to the destination ssid buffer.

Change-Id: Id3f579da97e398663b7d583f5f46d4671eabeae3
CRs-Fixed: 2233682

core/wma/src/wma_scan_roam.c

@@ -5166,7 +5166,7 @@ QDF_STATUS wma_set_epno_network_list(tp_wma_handle wma,
 					req->networks[i].ssid.length;
 			qdf_mem_copy(params->networks[i].ssid.mac_ssid,
 					req->networks[i].ssid.ssId,
-					WMI_MAC_MAX_SSID_LENGTH);
+					req->networks[i].ssid.length);
 		}
 	}