Even though ProcRenderComposite checks for pSrc->pDrawable being non-NULL, it
can still dereference it unconditionally later on. I'm going to attach a patch
that fixes this.
Created attachment 5572 [details] [review]
Fix potentiall NULL pointer dereference
Move parens such that all dereferences of pSrc->pDrawable are guarded by the
test for it not being NULL.
Created attachment 5573 [details] [review]
Actually, I think the idea was to compare the pScreens of pMask and pDst
instead of pMask and pSrc.
looks correct to me. applied to 1.1 branch and head, thanks!