[DPDK/ethdev Bug 1440] use after free in af_xdp

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1440

            Bug ID: 1440
           Summary: use after free in af_xdp
           Product: DPDK
           Version: 24.03
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: ethdev
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

#if defined(XDP_UMEM_UNALIGNED_CHUNK_FLAG)
static uint16_t
af_xdp_tx_zc(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
{

...
        for (i = 0; i < nb_pkts; i++) {
                mbuf = bufs[i];

                if (mbuf->pool == umem->mb_pool) {
...
                } else {
...
                        desc->addr = addr | offset;
                        rte_memcpy(pkt, rte_pktmbuf_mtod(mbuf, void *),
                                        desc->len);
                        rte_pktmbuf_free(mbuf);
                        count++;
                }

                tx_bytes += mbuf->pkt_len; <<< use after free above

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