qcacld-3.0: Add a limit check for total num powers

Currently there is no validaton for total num powers
which is calculated by adding powers sent by AP till
160 MHz and powers sent in ext element of the TPE IE.
total powers will increase more than allowed Tx powers
if AP sends some invalid value in ext count but array
limit is 15 only. which may become cause of out of
bound if AP sends some invalid value in ext count.

Fix is to add a validation check for total num powers.
If total num powers becaomes greater than allowed powers,
don't parse the ext element.

Change-Id: I1478b8d1dfa3c491a471790a12d0c3b0f62352f7
CRs-Fixed: 3695072

core/mac/src/pe/lim/lim_process_sme_req_messages.c

@@ -5690,7 +5690,11 @@ lim_update_ext_tpe_power(struct mac_context *mac, struct pe_session *session,
 		}
 
 		total_psd_power = existing_pwr_count + ext_psd_count;
-
+		if (total_psd_power > MAX_NUM_PWR_LEVEL) {
+			pe_debug("total powers greater than max %d",
+				 MAX_NUM_PWR_LEVEL);
+			return existing_pwr_count;
+		}
 		i = existing_pwr_count;
 		for (j = 0; j < ext_psd_count && i < total_psd_power; j++)
 		{