[PATCH 1/1] mf: Don't try to clone non existent topo connections.

[Bernhard Kölbl]

From: Bernhard Kölbl

Signed-off-by: Bernhard Kölbl 
---
 dlls/mf/tests/mf.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 dlls/mf/topology.c |  7 ++++++-
 2 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/dlls/mf/tests/mf.c b/dlls/mf/tests/mf.c
index e8d7252aa3f..34f6ad52182 100644
--- a/dlls/mf/tests/mf.c
+++ b/dlls/mf/tests/mf.c
@@ -1194,6 +1194,58 @@ static void test_topology(void)
     ok(ref == 0, "Release returned %ld\n", ref);
     ref = IMFTopologyNode_Release(node2);
     ok(ref == 0, "Release returned %ld\n", ref);
+
+    /* Try cloning a topology without connections */
+    hr = MFCreateTopology(&topology);
+    ok(hr == S_OK, "Failed to create topology, hr %#lx.\n", hr);
+
+    hr = MFCreateTopology(&topology2);
+    ok(hr == S_OK, "Failed to create topology, hr %#lx.\n", hr);
+
+    hr = MFCreateTopologyNode(MF_TOPOLOGY_TRANSFORM_NODE, &node);
+    ok(hr == S_OK, "Failed to create topology node, hr %#lx.\n", hr);
+
+    hr = MFCreateMediaType(&mediatype);
+    ok(hr == S_OK, "Failed to create media type, hr %#lx.\n", hr);
+
+    hr = MFCreateMediaType(&mediatype2);
+    ok(hr == S_OK, "Failed to create media type, hr %#lx.\n", hr);
+
+    hr = IMFTopologyNode_SetInputPrefType(node, 0, mediatype);
+    ok(hr == S_OK, "Failed to set preferred type, hr %#lx.\n", hr);
+
+    hr = IMFTopologyNode_SetInputPrefType(node, 1, mediatype2);
+    ok(hr == S_OK, "Failed to set preferred type, hr %#lx.\n", hr);
+
+    IMFMediaType_Release(mediatype2);
+    IMFMediaType_Release(mediatype);
+
+    hr = IMFTopology_AddNode(topology, node);
+    ok(hr == S_OK, "Failed to add a node, hr %#lx.\n", hr);
+    EXPECT_REF(node, 2);
+
+    hr = MFCreateTopologyNode(MF_TOPOLOGY_OUTPUT_NODE, &node2);
+    ok(hr == S_OK, "Failed to create topology node, hr %#lx.\n", hr);
+
+    hr = IMFTopology_AddNode(topology, node2);
+    ok(hr == S_OK, "Failed to add a node, hr %#lx.\n", hr);
+    EXPECT_REF(node, 2);
+
+    hr = IMFTopologyNode_ConnectOutput(node, 1, node2, 0);
+    ok(hr == S_OK, "Unexpected, hr %#lx.\n", hr);
+
+    hr = IMFTopology_CloneFrom(topology2, topology);
+    ok(hr == S_OK, "Failed to clone from topology, hr %#lx.\n", hr);
+
+    ref = IMFTopology_Release(topology2);
+    ok(ref == 0, "Release returned %ld\n", ref);
+    ref = IMFTopology_Release(topology);
+    ok(ref == 0, "Release returned %ld\n", ref);
+
+    ref = IMFTopologyNode_Release(node);
+    ok(ref == 0, "Release returned %ld\n", ref);
+    ref = IMFTopologyNode_Release(node2);
+    ok(ref == 0, "Release returned %ld\n", ref);
 }

static void test_topology_tee_node(void)
diff --git a/dlls/mf/topology.c b/dlls/mf/topology.c
index 25a00708100..b684b17ff72 100644
--- a/dlls/mf/topology.c
+++ b/dlls/mf/topology.c
@@ -712,7 +712,12 @@ static HRESULT WINAPI topology_CloneFrom(IMFTopology *iface, IMFTopology *src)
         for (j = 0; j < outputs->count; ++j)
         {
             DWORD input_index = outputs->streams[j].connection_stream;
-            TOPOID id = outputs->streams[j].connection->id;
+            TOPOID id;
+
+            if (!outputs->streams[j].connection)
+                continue;
+
+            id = outputs->streams[j].connection->id;

/* Skip node lookup in destination topology, assuming same node order. */
             if (SUCCEEDED(hr = topology_get_node_by_id(topology, id, &node)))