Chris Robinson : wined3d: Fix potential NULL dereference in IWineD3DSurfaceImpl_LockRect.

[Alexandre Julliard]

Module: wine
Branch: refs/heads/master
Commit: 13557abb7fa2ba8173e4c6bd3b66f2881c43e7ff
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=13557abb7fa2ba8173e4c6bd3b66f2881c43e7ff

Author: Chris Robinson <chris.kcat at gmail.com>
Date:   Mon Jul 31 06:36:55 2006 -0700

wined3d: Fix potential NULL dereference in IWineD3DSurfaceImpl_LockRect.

---

 dlls/wined3d/surface.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 67cd009..b11dda8 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -673,7 +673,7 @@ static HRESULT WINAPI IWineD3DSurfaceImp
 
             /* 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);
                     }