dmloader: Check for invalid class in EnableCache().

Fixes a test failure with sone Mingw versions. Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dmloader: Check for invalid class in EnableCache().
8d12efec · Alexandre Julliard · f779f36d · 8d12efec
Commit 8d12efec authored Jun 11, 2020 by Alexandre Julliard
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Showing with 4 additions and 2 deletions

loader.c dlls/dmloader/loader.c +4 -2

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--- a/dlls/dmloader/loader.c
+++ b/dlls/dmloader/loader.c
@@ -771,10 +771,12 @@ static HRESULT WINAPI IDirectMusicLoaderImpl_EnableCache(IDirectMusicLoader8 *if
    if (IsEqualGUID(class, &GUID_DirectMusicAllTypes))
        This->cache_class = enable ? ~0 : 0;
    else {
+        int idx = index_from_class(class);
+        if (idx == -1) return S_FALSE;
        if (enable)
-            This->cache_class |= 1 << index_from_class(class);
+            This->cache_class |= 1 << idx;
        else
-            This->cache_class &= ~(1 << index_from_class(class));
+            This->cache_class &= ~(1 << idx);
    }
    if (!enable)