ice: validate queue quanta parameters to prevent OOB access

Add queue wraparound prevention in quanta configuration.
Ensure end_qid does not overflow by validating start_qid and num_queues.

Fixes: 0153077 ("ice: Support VF queue rate limit and quanta size configuration")
Reviewed-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Jan Glaza <jan.glaza@intel.com>
Signed-off-by: Martyna Szapar-Mudlaw <martyna.szapar-mudlaw@linux.intel.com>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

Author: jglaza

drivers/net/ethernet/intel/ice/ice_virtchnl.c

@@ -1900,13 +1900,21 @@ static int ice_vc_cfg_q_bw(struct ice_vf *vf, u8 *msg)
  */
 static int ice_vc_cfg_q_quanta(struct ice_vf *vf, u8 *msg)
 {
+	u16 quanta_prof_id, quanta_size, start_qid, num_queues, end_qid, i;
 	enum virtchnl_status_code v_ret = VIRTCHNL_STATUS_SUCCESS;
-	u16 quanta_prof_id, quanta_size, start_qid, end_qid, i;
 	struct virtchnl_quanta_cfg *qquanta =
 		(struct virtchnl_quanta_cfg *)msg;
 	struct ice_vsi *vsi;
 	int ret;
 
+	start_qid = qquanta->queue_select.start_queue_id;
+	num_queues = qquanta->queue_select.num_queues;
+
+	if (check_add_overflow(start_qid, num_queues, &end_qid)) {
+		v_ret = VIRTCHNL_STATUS_ERR_PARAM;
+		goto err;
+	}
+
 	if (!test_bit(ICE_VF_STATE_ACTIVE, vf->vf_states)) {
 		v_ret = VIRTCHNL_STATUS_ERR_PARAM;
 		goto err;
@@ -1918,8 +1926,6 @@ static int ice_vc_cfg_q_quanta(struct ice_vf *vf, u8 *msg)
 		goto err;
 	}
 
-	end_qid = qquanta->queue_select.start_queue_id +
-		  qquanta->queue_select.num_queues;
 	if (end_qid > ICE_MAX_RSS_QS_PER_VF ||
 	    end_qid > min_t(u16, vsi->alloc_txq, vsi->alloc_rxq)) {
 		dev_err(ice_pf_to_dev(vf->pf), "VF-%d trying to configure more than allocated number of queues: %d\n",
@@ -1948,7 +1954,6 @@ static int ice_vc_cfg_q_quanta(struct ice_vf *vf, u8 *msg)
 		goto err;
 	}
 
-	start_qid = qquanta->queue_select.start_queue_id;
 	for (i = start_qid; i < end_qid; i++)
 		vsi->tx_rings[i]->quanta_prof_id = quanta_prof_id;