[PATCH] winmm: handle NULL szFileName in mmioOpen16 (Coverity)

[Marcus Meissner]

Hi,

CID 207, szFilename being NULL could be dereferenced in
one path. Check that and return.

Ciao, Marcus
---
 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 a750bf2..d3ab44b 100644
--- a/dlls/winmm/mmio.c
+++ b/dlls/winmm/mmio.c
@@ -614,6 +614,8 @@ 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))
-- 
1.5.6