codeql fixes for various subsystems

index 838b3a8f9f..8165e5adc0 100644
@@ -51,7 +51,9 @@ eth_mac_cmp(const char *key __rte_unused,
 		return -1; /* invalid devargs value */
 
 	/* Return 0 if devargs MAC is matching one of the device MACs. */
-	rte_eth_dev_info_get(data->port_id, &dev_info);
+	if (rte_eth_dev_info_get(data->port_id, &dev_info) < 0)
+		return -1;
+
 	for (index = 0; index < dev_info.max_mac_addrs; index++)
 		if (rte_is_same_ether_addr(&mac, &data->mac_addrs[index]))
 			return 0;

index f2a6c33a19..b99439e4f2 100644
@@ -2340,6 +2340,9 @@ rte_pmd_tun_probe(struct rte_vdev_device *dev)
 	struct rte_eth_dev *eth_dev;
 
 	name = rte_vdev_device_name(dev);
+	if (name == NULL)
+		return -1;
+
 	params = rte_vdev_device_args(dev);
 	memset(remote_iface, 0, RTE_ETH_NAME_MAX_LEN);
 

index 860fb5fb64..8d472505eb 100644
@@ -41,7 +41,7 @@ memzone_lookup_thread_unsafe(const char *name)
 	i = rte_fbarray_find_next_used(arr, 0);
 	while (i >= 0) {
 		mz = rte_fbarray_get(arr, i);
-		if (mz->addr != NULL &&
+		if ((mz != NULL) && (mz->addr != NULL) &&
 				!strncmp(name, mz->name, RTE_MEMZONE_NAMESIZE))
 			return mz;
 		i = rte_fbarray_find_next_used(arr, i + 1);

@@ -358,6 +358,10 @@ dump_memzone(const struct rte_memzone *mz, void *arg)
 	fprintf(f, "physical segments used:\n");
 	ms_idx = RTE_PTR_DIFF(mz->addr, msl->base_va) / page_sz;
 	ms = rte_fbarray_get(&msl->memseg_arr, ms_idx);
+	if (ms == NULL) {
+		RTE_LOG(DEBUG, EAL, "Skipping bad memzone\n");
+		return;
+	}
 
 	do {
 		fprintf(f, "  addr: %p iova: 0x%" PRIx64 " "

index 8d472505eb..930fee5fdc 100644
@@ -169,6 +169,10 @@ memzone_reserve_aligned_thread_unsafe(const char *name, size_t len,
 	}
 
 	struct malloc_elem *elem = malloc_elem_from_data(mz_addr);
+	if (elem == NULL) {
+		rte_errno = ENOSPC;
+		return NULL;
+	}
 
 	/* fill the zone in config */
 	mz_idx = rte_fbarray_find_next_free(arr, 0);

index d7c410b786..503e551bf9 100644
@@ -97,6 +97,8 @@ malloc_heap_add_memory(struct malloc_heap *heap, struct rte_memseg_list *msl,
 	malloc_elem_insert(elem);
 
 	elem = malloc_elem_join_adjacent_free(elem);
+	if (elem == NULL)
+		return NULL;
 
 	malloc_elem_free_list_insert(elem);
 

index 503e551bf9..3f41430e42 100644
@@ -323,6 +323,8 @@ alloc_pages_on_heap(struct malloc_heap *heap, uint64_t pg_sz, size_t elt_size,
 
 	map_addr = ms[0]->addr;
 	msl = rte_mem_virt2memseg_list(map_addr);
+	if (msl == NULL)
+		return NULL;
 
 	/* check if we wanted contiguous memory but didn't get it */
 	if (contig && !eal_memalloc_is_contig(msl, map_addr, alloc_sz)) {

index ab04479c1c..24506f8447 100644
@@ -126,6 +126,9 @@ eal_memalloc_is_contig(const struct rte_memseg_list *msl, void *start,
 
 		/* skip first iteration */
 		ms = rte_fbarray_get(&msl->memseg_arr, start_seg);
+		if (ms == NULL)
+			return false;
+
 		cur = ms->iova;
 		expected = cur + pgsz;
 

@@ -137,7 +140,7 @@ eal_memalloc_is_contig(const struct rte_memseg_list *msl, void *start,
 				cur_seg++, expected += pgsz) {
 			ms = rte_fbarray_get(&msl->memseg_arr, cur_seg);
 
-			if (ms->iova != expected)
+			if ((ms != NULL) && (ms->iova != expected))
 				return false;
 		}
 	}

index 83f05497cc..8f49812846 100644
@@ -63,6 +63,8 @@ malloc_elem_find_max_iova_contig(struct malloc_elem *elem, size_t align)
 
 	cur_page = RTE_PTR_ALIGN_FLOOR(contig_seg_start, page_sz);
 	ms = rte_mem_virt2memseg(cur_page, elem->msl);
+	if (ms == NULL)
+		return 0;
 
 	/* do first iteration outside the loop */
 	page_end = RTE_PTR_ADD(cur_page, page_sz);

@@ -91,9 +93,12 @@ malloc_elem_find_max_iova_contig(struct malloc_elem *elem, size_t align)
 			 * we're not blowing past data end.
 			 */
 			ms = rte_mem_virt2memseg(contig_seg_start, elem->msl);
-			cur_page = ms->addr;
-			/* don't trigger another recalculation */
-			expected_iova = ms->iova;
+			if (ms != NULL) {
+				cur_page = ms->addr;
+
+				/* don't trigger another recalculation */
+				expected_iova = ms->iova;
+			}
 			continue;
 		}
 		/* cur_seg_end ends on a page boundary or on data end. if we're

index 3f41430e42..88270ce4d2 100644
@@ -930,7 +930,7 @@ malloc_heap_free(struct malloc_elem *elem)
 		const struct rte_memseg *tmp =
 				rte_mem_virt2memseg(aligned_start, msl);
 
-		if (tmp->flags & RTE_MEMSEG_FLAG_DO_NOT_FREE) {
+		if ((tmp != NULL) && (tmp->flags & RTE_MEMSEG_FLAG_DO_NOT_FREE)) {
 			/* this is an unfreeable segment, so move start */
 			aligned_start = RTE_PTR_ADD(tmp->addr, tmp->len);
 		}

index 88270ce4d2..6eb6fcda5e 100644
@@ -892,6 +892,9 @@ malloc_heap_free(struct malloc_elem *elem)
 	/* anything after this is a bonus */
 	ret = 0;
 
+	if (elem == NULL)
+		goto free_unlock;
+
 	/* ...of which we can't avail if we are in legacy mode, or if this is an
 	 * externally allocated segment.
 	 */