winmm: Protect MCI_SYSINFO against null buffers.

4587a322 · Eric Pouech · Alexandre Julliard · 3d8507bc · 4587a322
Commit 4587a322 authored Oct 17, 2009 by Eric Pouech Committed by Alexandre Julliard Oct 19, 2009
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mci.c dlls/winmm/mci.c +2 -1

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--- a/dlls/winmm/mci.c
+++ b/dlls/winmm/mci.c
@@ -1834,7 +1834,8 @@ static	DWORD MCI_SysInfo(UINT uDevID, DWORD dwFlags, LPMCI_SYSINFO_PARMSW lpParm
    LPWINE_MCIDRIVER	wmd;
    HKEY		hKey;
-    if (lpParms == NULL)			return MCIERR_NULL_PARAMETER_BLOCK;
+    if (lpParms == NULL || lpParms->lpstrReturn == NULL)
+        return MCIERR_NULL_PARAMETER_BLOCK;
    TRACE("(%08x, %08X, %p[num=%d, wDevTyp=%u])\n",
 	  uDevID, dwFlags, lpParms, lpParms->dwNumber, lpParms->wDeviceType);