qcacld-3.0: Fix out-of-bounds in tx_stats

The tx_stats array length num_entries can't be more than
param_buf->num_tx_stats from fw.
Otherwies out-of-bounds will happen when read wmi_tx_stats.

Change-Id: I7ab3c7cc7baef6d903ba6301622bd67efe52cebe
CRs-Fixed: 3104318

core/wma/src/wma_utils.c

@@ -1147,9 +1147,9 @@ wma_fill_tx_stats(struct sir_wifi_ll_ext_stats *ll_stats,
 	struct sir_wifi_tx *tx_stats;
 	struct sir_wifi_ll_ext_peer_stats *peer_stats;
 	uint32_t *tx_mpdu_aggr, *tx_succ_mcs, *tx_fail_mcs, *tx_delay;
-	uint32_t len, dst_len, param_len, tx_mpdu_aggr_array_len,
-		 tx_succ_mcs_array_len, tx_fail_mcs_array_len,
-		 tx_delay_array_len;
+	uint32_t len, dst_len, param_len, num_entries,
+		 tx_mpdu_aggr_array_len, tx_succ_mcs_array_len,
+		 tx_fail_mcs_array_len, tx_delay_array_len;
 
 	result = *buf;
 	dst_len = *buf_length;
@@ -1228,6 +1228,12 @@ wma_fill_tx_stats(struct sir_wifi_ll_ext_stats *ll_stats,
 		return QDF_STATUS_E_FAILURE;
 	}
 
+	num_entries = fix_param->num_peer_ac_tx_stats * WLAN_MAX_AC;
+	if (num_entries > param_buf->num_tx_stats) {
+		wma_err("tx stats invalid arg, %d", num_entries);
+		return QDF_STATUS_E_FAILURE;
+	}
+
 	for (i = 0; i < fix_param->num_peer_ac_tx_stats; i++) {
 		uint32_t peer_id = wmi_peer_tx[i].peer_id;
 		struct sir_wifi_tx *ac;