Eric Pouech : winmm: Protect MCI_SYSINFO against null buffers.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 4587a322df75853d82048eba61ac523b5a2482d0
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=4587a322df75853d82048eba61ac523b5a2482d0

Author: Eric Pouech <eric.pouech at orange.fr>
Date:   Sat Oct 17 10:08:51 2009 +0200

winmm: Protect MCI_SYSINFO against null buffers.

---

 dlls/winmm/mci.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/dlls/winmm/mci.c b/dlls/winmm/mci.c
index 32204a0..b133ffc 100644
--- 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);