wined3d: Fix potential NULL dereference in IWineD3DSurfaceImpl_LockRect.

13557abb · Chris Robinson · Alexandre Julliard · 92bc96a9 · 13557abb
Commit 13557abb authored Jul 31, 2006 by Chris Robinson Committed by Alexandre Julliard Jul 31, 2006
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surface.c dlls/wined3d/surface.c +1 -1

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--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -673,7 +673,7 @@ static HRESULT WINAPI IWineD3DSurfaceImpl_LockRect(IWineD3DSurface *iface, WINED

            /* NOTE: In a shared context environment the renderTarget will use the same context as the implicit swapchain (we're not in a shared environment yet! */
            if ((swapchain == targetSwapChain && targetSwapChain != NULL) || iface == myDevice->renderTarget) {
-                    if (iface == swapchain->frontBuffer) {
+                    if (swapchain && iface == swapchain->frontBuffer) {
                        TRACE("locking front\n");
                        glReadBuffer(GL_FRONT);
                    }