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drm/i915: Defend against userspace creating a gem object with size==0 

We currently only round up the userspace size to the next page. We
assume that userspace hasn't made a mistake and requested a zero-length
gem object and all through our internal code we then presume that every
object is backed by at least a single page. Fix that oversight and
report EINVAL back to userspace if they try to create a zero length
object.

[danvet: This fixes tests/gem_bad_length]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Chris Wilson 2011-09-14 14:14:28 +02:00 committed by Keith Packard
parent 6dacfd2faa
commit 8ffc024681
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_gem.c
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@ -195,6 +195,8 @@ i915_gem_create(struct drm_file *file,
u32 handle; u32 handle;
size = roundup(size, PAGE_SIZE); size = roundup(size, PAGE_SIZE);
if (size == 0)
return -EINVAL;
/* Allocate the new object */ /* Allocate the new object */
obj = i915_gem_alloc_object(dev, size); obj = i915_gem_alloc_object(dev, size);