net/iavf: check cache pointer before dereference

The return value of rte_mempool_default_cache should be
checked as it can be NULL.

Fixes: 9ab9514c150e ("net/iavf: enable AVX512 for Tx")

Reported-by: Konstantin Ananyev <konstantin.ananyev@intel.com>
Signed-off-by: Wenzhuo Lu <wenzhuo.lu@intel.com>
Acked-by: Konstantin Ananyev <konstantin.ananyev@intel.com>

diff --git a/drivers/net/iavf/iavf_rxtx_vec_avx512.c b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
index 8680734..584d12e 100644 (file)
--- a/drivers/net/iavf/iavf_rxtx_vec_avx512.c
+++ b/drivers/net/iavf/iavf_rxtx_vec_avx512.c
@@ -1424,7 +1424,12 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
                struct rte_mempool *mp = txep[0].mbuf->pool;
                struct rte_mempool_cache *cache = rte_mempool_default_cache(mp,
                                                                rte_lcore_id());
-               void **cache_objs = &cache->objs[cache->len];
+               void **cache_objs;
+
+               if (!cache || cache->len == 0)
+                       goto normal;
+
+               cache_objs = &cache->objs[cache->len];
 
                if (n > RTE_MEMPOOL_CACHE_MAX_SIZE) {
                        rte_mempool_ops_enqueue_bulk(mp, (void *)txep, n);
@@ -1462,6 +1467,7 @@ iavf_tx_free_bufs_avx512(struct iavf_tx_queue *txq)
                goto done;
        }
 
+normal:
        m = rte_pktmbuf_prefree_seg(txep[0].mbuf);
        if (likely(m)) {
                free[0] = m;