Marcus Meissner : winmm: Handle NULL szFileName in mmioOpen16 (Coverity).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 8ba51495fc0b321cbaf6a516a43117c5cc310b50
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=8ba51495fc0b321cbaf6a516a43117c5cc310b50

Author: Marcus Meissner <marcus at jet.franken.de>
Date:   Sat Oct 17 16:00:44 2009 +0100

winmm: Handle NULL szFileName in mmioOpen16 (Coverity).

---

 dlls/winmm/mmio.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/dlls/winmm/mmio.c b/dlls/winmm/mmio.c
index 14fb4e3..b774003 100644
--- a/dlls/winmm/mmio.c
+++ b/dlls/winmm/mmio.c
@@ -598,6 +598,8 @@ static HMMIO MMIO_Open(LPSTR szFileName, MMIOINFO* refmminfo, DWORD dwOpenFlags,
     if (dwOpenFlags & (MMIO_PARSE|MMIO_EXIST)) {
 	char	buffer[MAX_PATH];
 
+	if (!szFileName)
+	    return (HMMIO)FALSE;
 	if (GetFullPathNameA(szFileName, sizeof(buffer), buffer, NULL) >= sizeof(buffer))
 	    return (HMMIO)FALSE;
 	if ((dwOpenFlags & MMIO_EXIST) && (GetFileAttributesA(buffer) == INVALID_FILE_ATTRIBUTES))