[3/6] winmm: The dwSize paramater of JOYINFOEX must be set correctly

[Bruno Jesus]

-------------- next part --------------
diff --git a/dlls/winmm/joystick.c b/dlls/winmm/joystick.c
index 9c06fc2..f4870fe 100644
--- a/dlls/winmm/joystick.c
+++ b/dlls/winmm/joystick.c
@@ -220,7 +220,7 @@ MMRESULT WINAPI DECLSPEC_HOTPATCH joyGetPosEx(UINT wID, LPJOYINFOEX lpInfo)
     TRACE("(%d, %p);\n", wID, lpInfo);
 
     if (!lpInfo) return MMSYSERR_INVALPARAM;
-    if (wID >= MAXJOYSTICK)	return JOYERR_PARMS;
+    if (wID >= MAXJOYSTICK || lpInfo->dwSize < sizeof(JOYINFOEX)) return JOYERR_PARMS;
     if (!JOY_LoadDriver(wID))	return MMSYSERR_NODRIVER;
 
     lpInfo->dwXpos = 0;