winmm: prevent NULL dereference in MCI_Close and add testcase for it

[Jan Zerebecki]

If this patch is rejected from inclusion, please tell me why, as
I would have to ask anyway.

From: Jan Zerebecki <jan.wine at zerebecki.de>
Changelog:
winmm: prevent NULL dereference in MCI_Close and add testcase for it
---

 dlls/winmm/mci.c             |    5 ++--
 dlls/winmm/tests/Makefile.in |    1 +
 dlls/winmm/tests/mci.c       |   51 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 55 insertions(+), 2 deletions(-)

diff --git a/dlls/winmm/mci.c b/dlls/winmm/mci.c
index b981ab0..7b44966 100644
--- a/dlls/winmm/mci.c
+++ b/dlls/winmm/mci.c
@@ -1797,8 +1797,9 @@ static	DWORD MCI_Close(UINT16 wDevID, DW
     MCI_UnLoadMciDriver(wmd);
 
     if (dwParam & MCI_NOTIFY)
-	mciDriverNotify((HWND)lpParms->dwCallback, wDevID,
-                        (dwRet == 0) ? MCI_NOTIFY_SUCCESSFUL : MCI_NOTIFY_FAILURE);
+        mciDriverNotify(lpParms ? (HWND)lpParms->dwCallback : 0,
+                        wDevID,
+                        dwRet ? MCI_NOTIFY_FAILURE : MCI_NOTIFY_SUCCESSFUL);
 
     return dwRet;
 }
diff --git a/dlls/winmm/tests/Makefile.in b/dlls/winmm/tests/Makefile.in
index e002f37..2865116 100644
--- a/dlls/winmm/tests/Makefile.in
+++ b/dlls/winmm/tests/Makefile.in
@@ -7,6 +7,7 @@ IMPORTS   = winmm user32 kernel32
 
 CTESTS = \
 	capture.c \
+	mci.c \
 	mixer.c \
 	mmio.c \
 	timer.c \
diff --git a/dlls/winmm/tests/mci.c b/dlls/winmm/tests/mci.c
new file mode 100644
index 0000000..4b608a7
--- /dev/null
+++ b/dlls/winmm/tests/mci.c
@@ -0,0 +1,51 @@
+/*
+ * Test winmm mci
+ *
+ * Copyright 2006 Jan Zerebecki
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include "wine/test.h"
+#include "winuser.h"
+#include "mmsystem.h"
+
+START_TEST(mci)
+{
+    int err;
+    const char command_open[] = "open new type waveaudio alias mysound";
+    const char command_close_my[] = "close mysound notify";
+    const char command_close_all[] = "close all notify";
+    MSG msg;
+
+    err = mciSendString(command_open, NULL, 0, NULL);
+    ok(!err,"mciSendString(%s, NULL, 0 , NULL) returned error: %d\n", command_open, err);
+
+    err = mciSendString(command_close_my, NULL, 0, NULL);
+    ok(!err,"mciSendString(%s, NULL, 0 , NULL) returned error: %d\n", command_close_my, err);
+
+    ok(PeekMessageW( &msg, (HWND)-1, 0, 0, PM_REMOVE ), "PeekMessage should succeed\n");
+    ok(msg.hwnd == NULL, "got %p instead of NULL\n", msg.hwnd);
+    ok(msg.message == MM_MCINOTIFY, "got %04x instead of MM_MCINOTIFY\n", msg.message);
+    ok(msg.wParam == MCI_NOTIFY_SUCCESSFUL, "got %08x instead of MCI_NOTIFY_SUCCESSFUL\n", msg.wParam);
+
+    err = mciSendString(command_close_all, NULL, 0, NULL);
+    todo_wine ok(!err,"mciSendString(%s, NULL, 0 , NULL) returned error: %d\n", command_close_all, err);
+
+    err = mciSendCommand(MCI_ALL_DEVICE_ID, MCI_CLOSE, MCI_NOTIFY, 0);
+    todo_wine ok(err == MCIERR_INVALID_DEVICE_ID,
+        "mciSendCommand(MCI_ALL_DEVICE_ID, MCI_CLOSE, MCI_NOTIFY, NULL) returned %d instead of %d\n",
+        err, MCIERR_INVALID_DEVICE_ID);
+}