net/pcap rx_infinite freeing from unallocated ring

https://bugs.dpdk.org/show_bug.cgi?id=548

            Bug ID: 548
           Summary: net/pcap rx_infinite freeing from unallocated ring
           Product: DPDK
           Version: 20.08
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: [email protected]
          Reporter: [email protected]

Target Milestone: ---

- create a new pcap with:

    rte_eal_hotplug_add(
        "vdev",
        "net_pcap_0",
        "rx_pcap=file.pcap,infinite_rx=1"
    );

- remove it:

    rte_eal_hotplug_remove("vdev", "net_pcap_0");

- problem:

eth_rx_queue_setup was not called so not ring was created eth_dev_close is called and tries to dequeue everything

segfault happens at rte_eth_pcap.c:743 because pcap_q->pkts is NULL

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