i40e flow flush & add new flow will occur segfault

https://bugs.dpdk.org/show_bug.cgi?id=265

            Bug ID: 265
           Summary: i40e flow flush & add new flow will occur segfault
           Product: DPDK
           Version: 18.11
          Hardware: x86
                OS: Linux
            Status: CONFIRMED
          Severity: major
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

in this commit id 2e67a7fbf3ffd64cf18a565535135794b62af74d

* net/i40e: config flow director automatically

function i40e_flow_destroy/i40e_flow_flush_fdir_filter add a i40e_fdir_teardown call! it will release all fdir resource!

when call flow flush and add a new flow（i40e_flow_add_del_fdir_filter -> i40e_flow_fdir_filter_programming） will access a null pointer!

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