From: Jacob Keller <jacob.e.keller@intel.com>
Date: Thu, 28 Feb 2019 09:52:53 -0800
Subject: i40e: remove out-of-range comparisons in i40e_validate_cloud_filter
Patch-mainline: v5.2-rc1
Git-commit: a01e5f222f210548ee88de8841176562d5d52c24
References: jsc#SLE-4797

The function i40e_validate_cloud_filter checks that the destination and
source port numbers are valid by attempting to ensure that the number is
non-zero and no larger than 0xFFFF. However, the types for the dst_port
and src_port variable are __be16 which by definition cannot be larger
than 0xFFFF

Since these values cannot be larger than 2 bytes, the check to see if
they exceed 0xFFFF is meaningless.

One might consider these checks as some sort of defensive coding, in
case the type was later changed. However, these checks also byte-swap
the value before comparison using be16_to_cpu, which will truncate the
values to 16bits anyways. Additionally, changing the type would require
updating the opcodes to support new data layout of these virtchnl
commands.

Remove the check to silence the -Wtype-limits warning that was added to
GCC 8.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3152,7 +3152,7 @@ static int i40e_validate_cloud_filter(st
 	}
 
 	if (mask.dst_port & data.dst_port) {
-		if (!data.dst_port || be16_to_cpu(data.dst_port) > 0xFFFF) {
+		if (!data.dst_port) {
 			dev_info(&pf->pdev->dev, "VF %d: Invalid Dest port\n",
 				 vf->vf_id);
 			goto err;
@@ -3160,7 +3160,7 @@ static int i40e_validate_cloud_filter(st
 	}
 
 	if (mask.src_port & data.src_port) {
-		if (!data.src_port || be16_to_cpu(data.src_port) > 0xFFFF) {
+		if (!data.src_port) {
 			dev_info(&pf->pdev->dev, "VF %d: Invalid Source port\n",
 				 vf->vf_id);
 			goto err;