net/i40e: fix 32-bit build

[ upstream commit d012018 ]

Got error with: gcc 11.2.1 "cc (GCC) 11.2.1 20210728 (Red Hat 11.2.1-1)"

Build error:
In function ‘i40e_flow_parse_fdir_pattern’,
    inlined from ‘i40e_flow_parse_fdir_filter’
    at ../drivers/net/i40e/i40e_flow.c:3274:8:
../drivers/net/i40e/i40e_flow.c:3052:69:
    error: writing 1 byte into a region of size 0
    [-Werror=stringop-overflow=]
 3052 |                         filter->input.flow_ext.flexbytes[j] =
      |                         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
 3053 |                                 raw_spec->pattern[i];
      |                                 ~~~~~~~~~~~~~~~~~~~~
In file included from ../drivers/net/i40e/i40e_flow.c:25:
  ../drivers/net/i40e/i40e_flow.c:
  In function ‘i40e_flow_parse_fdir_filter’:
  ../drivers/net/i40e/i40e_ethdev.h:638:17:
  note: at offset 16 into destination object ‘flexbytes’ of size 16
  638 |         uint8_t flexbytes[RTE_ETH_FDIR_MAX_FLEXLEN];
      |                 ^~~~~~~~~

Fixing by adding range checks.

Fixes: 6ced3dd ("net/i40e: support flexible payload parsing for FDIR")

Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Qi Zhang <qi.z.zhang@intel.com>

drivers/net/i40e/i40e_flow.c

@@ -2901,6 +2901,9 @@ i40e_flow_parse_fdir_pattern(struct rte_eth_dev *dev,
 
 			for (i = 0; i < raw_spec->length; i++) {
 				j = i + next_dst_off;
+				if (j >= RTE_ETH_FDIR_MAX_FLEXLEN ||
+						j >= I40E_FDIR_MAX_FLEX_LEN)
+					break;
 				filter->input.flow_ext.flexbytes[j] =
 					raw_spec->pattern[i];
 				filter->input.flow_ext.flex_mask[j] =