atl: Avoid NULL pointer reference in AtlComModuleRevokeClassObjects().

dlls/atl/atl.c

@@ -598,6 +598,9 @@ HRESULT WINAPI AtlComModuleRevokeClassObjects(_ATL_COM_MODULE *module)
         return E_INVALIDARG;
 
     for(iter = module->m_ppAutoObjMapFirst; iter < module->m_ppAutoObjMapLast; iter++) {
+        if(!(*iter))
+            continue;
+
         hres = CoRevokeClassObject((*iter)->dwRegister);
         if(FAILED(hres))
             return hres;
@@ -617,6 +620,9 @@ HRESULT WINAPI AtlComModuleRevokeClassObjects(_ATL_COM_MODULE *module)
         return E_INVALIDARG;
 
     for(iter = module->m_ppAutoObjMapFirst; iter < module->m_ppAutoObjMapLast; iter++) {
+        if(!(*iter))
+            continue;
+
         hres = CoRevokeClassObject((*iter)->pCache->dwRegister);
         if(FAILED(hres))
             return hres;

dlls/atl100/tests/atl.c

@@ -1115,6 +1115,31 @@ static void test_AtlComModuleRegisterClassObjects(void)
     ok(hr == S_FALSE, "Unexpected hr %#lx.\n", hr);
 }
 
+static void test_AtlComModuleRevokeClassObjects(void)
+{
+    _ATL_OBJMAP_ENTRY *null_entry = NULL;
+    _ATL_COM_MODULE module;
+    HRESULT hr;
+
+    /* Test NULL module */
+    hr = AtlComModuleRevokeClassObjects(NULL);
+    ok(hr == E_INVALIDARG, "Unexpected hr %#lx.\n", hr);
+
+    /* Test NULL m_ppAutoObjMapFirst and m_ppAutoObjMapLast */
+    module.cbSize = sizeof(module);
+    module.m_ppAutoObjMapFirst = NULL;
+    module.m_ppAutoObjMapLast = NULL;
+    hr = AtlComModuleRevokeClassObjects(&module);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+
+    /* Test m_ppAutoObjMapFirst and m_ppAutoObjMapLast both pointing to a NULL entry */
+    module.cbSize = sizeof(module);
+    module.m_ppAutoObjMapFirst = &null_entry;
+    module.m_ppAutoObjMapLast = &null_entry;
+    hr = AtlComModuleRevokeClassObjects(&module);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+}
+
 START_TEST(atl)
 {
     if (!register_class())
@@ -1132,6 +1157,7 @@ START_TEST(atl)
     test_AtlAxCreateControl();
     test_AtlComModuleGetClassObject();
     test_AtlComModuleRegisterClassObjects();
+    test_AtlComModuleRevokeClassObjects();
 
     CoUninitialize();
 }

dlls/atl110/tests/atl.c

@@ -82,12 +82,38 @@ static void test_AtlComModuleRegisterClassObjects(void)
     ok(hr == S_FALSE, "Unexpected hr %#lx.\n", hr);
 }
 
+static void test_AtlComModuleRevokeClassObjects(void)
+{
+    _ATL_OBJMAP_ENTRY_EX *null_entry = NULL;
+    _ATL_COM_MODULE module;
+    HRESULT hr;
+
+    /* Test NULL module */
+    hr = AtlComModuleRevokeClassObjects(NULL);
+    ok(hr == E_INVALIDARG, "Unexpected hr %#lx.\n", hr);
+
+    /* Test NULL m_ppAutoObjMapFirst and m_ppAutoObjMapLast */
+    module.cbSize = sizeof(module);
+    module.m_ppAutoObjMapFirst = NULL;
+    module.m_ppAutoObjMapLast = NULL;
+    hr = AtlComModuleRevokeClassObjects(&module);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+
+    /* Test m_ppAutoObjMapFirst and m_ppAutoObjMapLast both pointing to a NULL entry */
+    module.cbSize = sizeof(module);
+    module.m_ppAutoObjMapFirst = &null_entry;
+    module.m_ppAutoObjMapLast = &null_entry;
+    hr = AtlComModuleRevokeClassObjects(&module);
+    ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
+}
+
 START_TEST(atl)
 {
     CoInitialize(NULL);
 
     test_AtlComModuleGetClassObject();
     test_AtlComModuleRegisterClassObjects();
+    test_AtlComModuleRevokeClassObjects();
 
     CoUninitialize();
 }