For example, calling IDirectFBDisplayLayer_EnableCursor() leads to a SIGSEGV within dfb_windowstack_lock() because of a deference of the uninitialized CoreWindowStack *stack variable.
The patch introduces few more additional checks, just like what has been implemented in IDirectFBDisplayLayer_SetBackgroundMode() and IDirectFBDisplayLayer_SetBackgroundImage().
0001-idirectfbdisplaylayer-check-if-data-stack-isn-t-NULL.patch
Description: 0001-idirectfbdisplaylayer-check-if-data-stack-isn-t-NULL.patch
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