Quoting Matthew Auld (2018-05-02 20:50:21)
> Operating on a zero sized GEM userptr object will lead to explosions.
>
> Fixes: 5cc9ed4b9a7a ("drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl")
> Testcase: igt/gem_userptr_blits/input-checking
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Picked up for pushing in the next wave. Thanks for the fix and testcase,
-Chris
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