[PATCH 4.14 12/48] i40e: add num_vectors checker in iwarp handler

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Sergey Nemov <sergey.nemov@intel.com>

commit 7015ca3df965378bcef072cca9cd63ed098665b5 upstream.

Field num_vectors from struct virtchnl_iwarp_qvlist_info should not be
larger than num_msix_vectors_vf in the hw struct.  The iwarp uses the
same set of vectors as the LAN VF driver.

Signed-off-by: Sergey Nemov <sergey.nemov@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -419,6 +419,16 @@ static int i40e_config_iwarp_qvlist(stru
 	u32 next_q_idx, next_q_type;
 	u32 msix_vf, size;
 
+	msix_vf = pf->hw.func_caps.num_msix_vectors_vf;
+
+	if (qvlist_info->num_vectors > msix_vf) {
+		dev_warn(&pf->pdev->dev,
+			 "Incorrect number of iwarp vectors %u. Maximum %u allowed.\n",
+			 qvlist_info->num_vectors,
+			 msix_vf);
+		goto err;
+	}
+
 	size = sizeof(struct virtchnl_iwarp_qvlist_info) +
 	       (sizeof(struct virtchnl_iwarp_qv_info) *
 						(qvlist_info->num_vectors - 1));