Update success notification is displayed correctly for all settings; fixed posible null dereferencing in the updater

ExplorerPatcher/dllmain.c

@@ -240,9 +240,44 @@ DWORD CheckForUpdatesThread(LPVOID unused)
     hEvents[1] = CreateEventW(NULL, FALSE, FALSE, L"EP_Ev_InstallUpdates_" _T(EP_CLSID));
     if (hEvents[0] && hEvents[1])
     {
+        if (bShowUpdateToast)
+        {
+            ShowUpdateSuccessNotification(hModule, notifier, notifFactory, &toast);
+
+            HKEY hKey = NULL;
+
+            RegCreateKeyExW(
+                HKEY_CURRENT_USER,
+                TEXT(REGPATH),
+                0,
+                NULL,
+                REG_OPTION_NON_VOLATILE,
+                KEY_READ | KEY_WOW64_64KEY | KEY_WRITE,
+                NULL,
+                &hKey,
+                NULL
+            );
+            if (hKey == NULL || hKey == INVALID_HANDLE_VALUE)
+            {
+                hKey = NULL;
+            }
+            if (hKey)
+            {
+                bShowUpdateToast = FALSE;
+                RegSetValueExW(
+                    hKey,
+                    TEXT("IsUpdatePending"),
+                    0,
+                    REG_DWORD,
+                    &bShowUpdateToast,
+                    sizeof(DWORD)
+                );
+                RegCloseKey(hKey);
+            }
+        }
         if (dwUpdatePolicy != UPDATE_POLICY_MANUAL)
         {
-            InstallUpdatesIfAvailable(hModule, bShowUpdateToast, notifier, notifFactory, &toast, UPDATES_OP_DEFAULT, bAllocConsole, dwUpdatePolicy);
+            InstallUpdatesIfAvailable(hModule, notifier, notifFactory, &toast, UPDATES_OP_DEFAULT, bAllocConsole, dwUpdatePolicy);
         }
         DWORD dwRet = 0;
         while (TRUE)
@@ -251,12 +286,12 @@ DWORD CheckForUpdatesThread(LPVOID unused)
             {
             case WAIT_OBJECT_0:
             {
-                InstallUpdatesIfAvailable(hModule, bShowUpdateToast, notifier, notifFactory, &toast, UPDATES_OP_CHECK, bAllocConsole, dwUpdatePolicy);
+                InstallUpdatesIfAvailable(hModule, notifier, notifFactory, &toast, UPDATES_OP_CHECK, bAllocConsole, dwUpdatePolicy);
                 break;
             }
             case WAIT_OBJECT_0 + 1:
             {
-                InstallUpdatesIfAvailable(hModule, bShowUpdateToast, notifier, notifFactory, &toast, UPDATES_OP_INSTALL, bAllocConsole, dwUpdatePolicy);
+                InstallUpdatesIfAvailable(hModule, notifier, notifFactory, &toast, UPDATES_OP_INSTALL, bAllocConsole, dwUpdatePolicy);
                 break;
             }
             default:

ExplorerPatcher/updates.c

@@ -320,7 +320,10 @@ BOOL IsUpdateAvailableHelper(
 
                             if (*toast)
                             {
-                                notifier->lpVtbl->Hide(notifier, *toast);
+                                if (notifier)
+                                {
+                                    notifier->lpVtbl->Hide(notifier, *toast);
+                                }
                                 (*toast)->lpVtbl->Release((*toast));
                                 (*toast) = NULL;
                             }
@@ -636,20 +639,13 @@ BOOL UpdateProduct(
     );
 }
 
-BOOL InstallUpdatesIfAvailable(
+BOOL ShowUpdateSuccessNotification(
     HMODULE hModule,
-    BOOL bIsPostUpdate,
     __x_ABI_CWindows_CUI_CNotifications_CIToastNotifier* notifier,
     __x_ABI_CWindows_CUI_CNotifications_CIToastNotificationFactory* notifFactory,
-    __x_ABI_CWindows_CUI_CNotifications_CIToastNotification** toast,
+    __x_ABI_CWindows_CUI_CNotifications_CIToastNotification** toast
-    DWORD dwOperation, 
-    DWORD bAllocConsole, 
-    DWORD dwUpdatePolicy
 )
 {
-    wchar_t wszInfoURL[MAX_PATH];
-    ZeroMemory(wszInfoURL, MAX_PATH * sizeof(wchar_t));
-    wcscat_s(wszInfoURL, MAX_PATH, _T(UPDATES_RELEASE_INFO_URL_STABLE));
     wchar_t buf[TOAST_BUFSIZ];
     DWORD dwLeftMost = 0;
     DWORD dwSecondLeft = 0;
@@ -657,78 +653,70 @@ BOOL InstallUpdatesIfAvailable(
     DWORD dwRightMost = 0;
     QueryVersionInfo(hModule, VS_VERSION_INFO, &dwLeftMost, &dwSecondLeft, &dwSecondRight, &dwRightMost);
 
-    if (bIsPostUpdate)
+    __x_ABI_CWindows_CData_CXml_CDom_CIXmlDocument* inputXml = NULL;
+    const wchar_t text[] =
+        L"<toast displayTimestamp=\"2021-08-29T00:00:00.000Z\" scenario=\"reminder\" "
+        L"activationType=\"protocol\" launch=\"" _T(UPDATES_RELEASE_INFO_URL) L"\" duration=\"short\">\r\n"
+        L"	<visual>\r\n"
+        L"		<binding template=\"ToastGeneric\">\r\n"
+        L"			<text><![CDATA[Update successful]]></text>\r\n"
+        L"			<text><![CDATA[Installed version: %d.%d.%d.%d]]></text>\r\n"
+        L"			<text placement=\"attribution\"><![CDATA[ExplorerPatcher]]></text>\r\n"
+        L"		</binding>\r\n"
+        L"	</visual>\r\n"
+        L"	<audio src=\"ms-winsoundevent:Notification.Default\" loop=\"false\" silent=\"false\"/>\r\n"
+        L"</toast>\r\n";
+    swprintf_s(buf, TOAST_BUFSIZ, text, dwLeftMost, dwSecondLeft, dwSecondRight, dwRightMost);
+    String2IXMLDocument(
+        buf,
+        wcslen(buf),
+        &inputXml,
+        NULL
+    );
+    if (*toast)
     {
-        __x_ABI_CWindows_CData_CXml_CDom_CIXmlDocument* inputXml = NULL;
+        if (notifier)
-        const wchar_t text[] =
-            L"<toast displayTimestamp=\"2021-08-29T00:00:00.000Z\" scenario=\"reminder\" "
-            L"activationType=\"protocol\" launch=\"" _T(UPDATES_RELEASE_INFO_URL) L"\" duration=\"short\">\r\n"
-            L"	<visual>\r\n"
-            L"		<binding template=\"ToastGeneric\">\r\n"
-            L"			<text><![CDATA[Update successful]]></text>\r\n"
-            L"			<text><![CDATA[Installed version: %d.%d.%d.%d]]></text>\r\n"
-            L"			<text placement=\"attribution\"><![CDATA[ExplorerPatcher]]></text>\r\n"
-            L"		</binding>\r\n"
-            L"	</visual>\r\n"
-            L"	<audio src=\"ms-winsoundevent:Notification.Default\" loop=\"false\" silent=\"false\"/>\r\n"
-            L"</toast>\r\n";
-        swprintf_s(buf, TOAST_BUFSIZ, text, dwLeftMost, dwSecondLeft, dwSecondRight, dwRightMost);
-        String2IXMLDocument(
-            buf,
-            wcslen(buf),
-            &inputXml,
-            NULL
-        );
-        if (*toast)
         {
             notifier->lpVtbl->Hide(notifier, *toast);
-            (*toast)->lpVtbl->Release((*toast));
-            (*toast) = NULL;
         }
+        (*toast)->lpVtbl->Release((*toast));
+        (*toast) = NULL;
+    }
+    if (notifFactory)
+    {
         notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
-        if (*toast)
+    }
-        {
+    if ((*toast) && notifier)
-            notifier->lpVtbl->Show(notifier, *toast);
+    {
-        }
+        notifier->lpVtbl->Show(notifier, *toast);
-        if (inputXml)
+    }
-        {
+    if (inputXml)
-            inputXml->lpVtbl->Release(inputXml);
+    {
-        }
+        inputXml->lpVtbl->Release(inputXml);
-        
+    }
-        HKEY hKey = NULL;
-        DWORD dwSize = 0;
 
-        RegCreateKeyExW(
+    SwitchToThread();
-            HKEY_CURRENT_USER,
+}
-            TEXT(REGPATH),
-            0,
-            NULL,
-            REG_OPTION_NON_VOLATILE,
-            KEY_READ | KEY_WOW64_64KEY | KEY_WRITE,
-            NULL,
-            &hKey,
-            NULL
-        );
-        if (hKey == NULL || hKey == INVALID_HANDLE_VALUE)
-        {
-            hKey = NULL;
-        }
-        if (hKey)
-        {
-            dwSize = FALSE;
-            RegSetValueExW(
-                hKey,
-                TEXT("IsUpdatePending"),
-                0,
-                REG_DWORD,
-                &dwSize,
-                sizeof(DWORD)
-            );
-            RegCloseKey(hKey);
-        }
 
-        SwitchToThread();
+BOOL InstallUpdatesIfAvailable(
-    }
+    HMODULE hModule,
+    __x_ABI_CWindows_CUI_CNotifications_CIToastNotifier* notifier,
+    __x_ABI_CWindows_CUI_CNotifications_CIToastNotificationFactory* notifFactory,
+    __x_ABI_CWindows_CUI_CNotifications_CIToastNotification** toast,
+    DWORD dwOperation, 
+    DWORD bAllocConsole, 
+    DWORD dwUpdatePolicy
+)
+{
+    wchar_t wszInfoURL[MAX_PATH];
+    ZeroMemory(wszInfoURL, MAX_PATH * sizeof(wchar_t));
+    wcscat_s(wszInfoURL, MAX_PATH, _T(UPDATES_RELEASE_INFO_URL_STABLE));
+    wchar_t buf[TOAST_BUFSIZ];
+    DWORD dwLeftMost = 0;
+    DWORD dwSecondLeft = 0;
+    DWORD dwSecondRight = 0;
+    DWORD dwRightMost = 0;
+    QueryVersionInfo(hModule, VS_VERSION_INFO, &dwLeftMost, &dwSecondLeft, &dwSecondRight, &dwRightMost);
 
     if (bAllocConsole)
     {
@@ -804,12 +792,18 @@ BOOL InstallUpdatesIfAvailable(
     {
         if (*toast)
         {
-            notifier->lpVtbl->Hide(notifier, *toast);
+            if (notifier)
+            {
+                notifier->lpVtbl->Hide(notifier, *toast);
+            }
             (*toast)->lpVtbl->Release((*toast));
             (*toast) = NULL;
         }
-        notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+        if (notifFactory)
-        if ((*toast))
+        {
+            notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+        }
+        if ((*toast) && notifier)
         {
             notifier->lpVtbl->Show(notifier, *toast);
         }
@@ -863,12 +857,18 @@ BOOL InstallUpdatesIfAvailable(
             {
                 if (*toast)
                 {
-                    notifier->lpVtbl->Hide(notifier, *toast);
+                    if (notifier)
+                    {
+                        notifier->lpVtbl->Hide(notifier, *toast);
+                    }
                     (*toast)->lpVtbl->Release((*toast));
                     (*toast) = NULL;
                 }
-                notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+                if (notifFactory)
-                if ((*toast))
+                {
+                    notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+                }
+                if ((*toast) && notifier)
                 {
                     notifier->lpVtbl->Show(notifier, *toast);
                 }
@@ -902,12 +902,18 @@ BOOL InstallUpdatesIfAvailable(
             );
             if (*toast)
             {
-                notifier->lpVtbl->Hide(notifier, *toast);
+                if (notifier)
+                {
+                    notifier->lpVtbl->Hide(notifier, *toast);
+                }
                 (*toast)->lpVtbl->Release((*toast));
                 (*toast) = NULL;
             }
-            notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+            if (notifFactory)
-            if ((*toast))
+            {
+                notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+            }
+            if ((*toast) && notifier)
             {
                 notifier->lpVtbl->Show(notifier, *toast);
             }
@@ -964,12 +970,18 @@ BOOL InstallUpdatesIfAvailable(
             );
             if (*toast)
             {
-                notifier->lpVtbl->Hide(notifier, *toast);
+                if (notifier)
+                {
+                    notifier->lpVtbl->Hide(notifier, *toast);
+                }
                 (*toast)->lpVtbl->Release((*toast));
                 (*toast) = NULL;
             }
-            notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+            if (notifFactory)
-            if ((*toast))
+            {
+                notifFactory->lpVtbl->CreateToastNotification(notifFactory, inputXml, toast);
+            }
+            if ((*toast) && notifier)
             {
                 notifier->lpVtbl->Show(notifier, *toast);
             }

ExplorerPatcher/updates.h

@@ -37,9 +37,14 @@ typedef struct IsUpdateAvailableParameters
 };
 
 BOOL IsUpdatePolicy(LPCWSTR wszDataStore, DWORD dwUpdatePolicy);
+BOOL ShowUpdateSuccessNotification(
+	HMODULE hModule,
+	__x_ABI_CWindows_CUI_CNotifications_CIToastNotifier* notifier,
+	__x_ABI_CWindows_CUI_CNotifications_CIToastNotificationFactory* notifFactory,
+	__x_ABI_CWindows_CUI_CNotifications_CIToastNotification** toast
+);
 BOOL InstallUpdatesIfAvailable(
 	HMODULE hModule,
-	BOOL bIsPostUpdate,
 	__x_ABI_CWindows_CUI_CNotifications_CIToastNotifier* notifier,
 	__x_ABI_CWindows_CUI_CNotifications_CIToastNotificationFactory* notifFactory,
 	__x_ABI_CWindows_CUI_CNotifications_CIToastNotification** toast,