diff --git a/libs/vkd3d/device.c b/libs/vkd3d/device.c
index 86764342..9b18bc90 100644
--- a/libs/vkd3d/device.c
+++ b/libs/vkd3d/device.c
@@ -2306,29 +2306,27 @@ static void STDMETHODCALLTYPE d3d12_device_CopyDescriptors(ID3D12Device *iface,
     }
 
     dst_range_idx = dst_idx = 0;
-    dst = d3d12_desc_from_cpu_handle(dst_descriptor_range_offsets[0]);
-    dst_range_size = dst_descriptor_range_sizes ? dst_descriptor_range_sizes[0] : 1;
-    for (src_range_idx = 0; src_range_idx < src_descriptor_range_count; ++src_range_idx)
+    src_range_idx = src_idx = 0;
+    while (dst_range_idx < dst_descriptor_range_count && src_range_idx < src_descriptor_range_count)
     {
-        src = d3d12_desc_from_cpu_handle(src_descriptor_range_offsets[src_range_idx]);
+        dst_range_size = dst_descriptor_range_sizes ? dst_descriptor_range_sizes[dst_range_idx] : 1;
         src_range_size = src_descriptor_range_sizes ? src_descriptor_range_sizes[src_range_idx] : 1;
-        for (src_idx = 0; src_idx < src_range_size; ++src_idx)
+
+        dst = d3d12_desc_from_cpu_handle(dst_descriptor_range_offsets[dst_range_idx]);
+        src = d3d12_desc_from_cpu_handle(src_descriptor_range_offsets[src_range_idx]);
+
+        while (dst_idx < dst_range_size && src_idx < src_range_size)
+            d3d12_desc_copy(&dst[dst_idx++], &src[src_idx++], device);
+
+        if (dst_idx >= dst_range_size)
         {
-            if (dst_idx >= dst_range_size)
-            {
-                dst_idx = 0;
-                ++dst_range_idx;
-
-                if (dst_range_idx >= dst_descriptor_range_count)
-                    return;
-
-                dst = d3d12_desc_from_cpu_handle(dst_descriptor_range_offsets[dst_range_idx]);
-                dst_range_size = dst_descriptor_range_sizes ? dst_descriptor_range_sizes[dst_range_idx] : 1;
-            }
-
-            d3d12_desc_copy(dst++, src++, device);
-
-            ++dst_idx;
+            ++dst_range_idx;
+            dst_idx = 0;
+        }
+        if (src_idx >= src_range_size)
+        {
+            ++src_range_idx;
+            src_idx = 0;
         }
     }
 }
diff --git a/libs/vkd3d/resource.c b/libs/vkd3d/resource.c
index a6c22fd0..84855853 100644
--- a/libs/vkd3d/resource.c
+++ b/libs/vkd3d/resource.c
@@ -1600,6 +1600,8 @@ static void d3d12_desc_destroy(struct d3d12_desc *descriptor,
 void d3d12_desc_copy(struct d3d12_desc *dst, const struct d3d12_desc *src,
         struct d3d12_device *device)
 {
+    assert(dst != src);
+
     d3d12_desc_destroy(dst, device);
 
     *dst = *src;
diff --git a/tests/d3d12.c b/tests/d3d12.c
index a9255b38..79bca280 100644
--- a/tests/d3d12.c
+++ b/tests/d3d12.c
@@ -15168,12 +15168,16 @@ static void test_copy_descriptors(void)
 
     dst_handles[0] = get_cpu_descriptor_handle(&context, heap, 9);
     dst_range_sizes[0] = 4;
-    dst_handles[1] = get_cpu_descriptor_handle(&context, heap, 13);
-    dst_range_sizes[1] = 3;
+    dst_handles[1] = get_cpu_descriptor_handle(&context, heap, 9);
+    dst_range_sizes[1] = 0;
+    dst_handles[2] = get_cpu_descriptor_handle(&context, heap, 13);
+    dst_range_sizes[2] = 3;
+    dst_handles[3] = get_cpu_descriptor_handle(&context, heap, 13);
+    dst_range_sizes[3] = 0;
     src_handles[0] = get_cpu_descriptor_handle(&context, cpu_heap, 10);
-    src_range_sizes[0] = 7;
+    src_range_sizes[0] = 8;
     /* t0-t6 */
-    ID3D12Device_CopyDescriptors(device, 2, dst_handles, dst_range_sizes,
+    ID3D12Device_CopyDescriptors(device, 4, dst_handles, dst_range_sizes,
             1, src_handles, src_range_sizes, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
 
     /* copy 1 uninitialized descriptor (19) */
@@ -15195,6 +15199,28 @@ static void test_copy_descriptors(void)
             get_cpu_descriptor_handle(&context, cpu_heap, 22),
             D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
 
+    /* range sizes equal to 0 */
+    dst_handles[0] = get_cpu_descriptor_handle(&context, heap, 19);
+    dst_range_sizes[0] = 0;
+    dst_handles[1] = get_cpu_descriptor_handle(&context, heap, 19);
+    dst_range_sizes[1] = 0;
+    src_handles[0] = get_cpu_descriptor_handle(&context, cpu_heap, 0);
+    src_range_sizes[0] = 1;
+    src_handles[1] = get_cpu_descriptor_handle(&context, cpu_heap, 0);
+    src_range_sizes[1] = 4;
+    ID3D12Device_CopyDescriptors(device, 2, dst_handles, dst_range_sizes,
+            2, src_handles, src_range_sizes, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
+    dst_handles[0] = get_cpu_descriptor_handle(&context, heap, 19);
+    dst_range_sizes[0] = 4;
+    dst_handles[1] = get_cpu_descriptor_handle(&context, heap, 19);
+    dst_range_sizes[1] = 4;
+    src_handles[0] = get_cpu_descriptor_handle(&context, cpu_heap, 0);
+    src_range_sizes[0] = 0;
+    src_handles[1] = get_cpu_descriptor_handle(&context, cpu_heap, 0);
+    src_range_sizes[1] = 0;
+    ID3D12Device_CopyDescriptors(device, 2, dst_handles, dst_range_sizes,
+            2, src_handles, src_range_sizes, D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
+
     ID3D12GraphicsCommandList_SetComputeRootSignature(command_list, context.root_signature);
     heaps[0] = sampler_heap; heaps[1] = heap;
     ID3D12GraphicsCommandList_SetDescriptorHeaps(command_list, ARRAY_SIZE(heaps), heaps);