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drm/i915: Enforce execobject.alignment to be a power-of-two 

Internal requirement for the alignment is that it must be a
power-of-two, so enforce rejection at the user interface to execbuffer
(which allows the caller to specify a stricter-than-expected alignment
criterion).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2015-06-19 13:59:46 +01:00 committed by Daniel Vetter
parent 77a0d1cab4
commit 55a9785d12
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
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@ -957,6 +957,9 @@ validate_exec_list(struct drm_device *dev,
if (exec[i].flags & invalid_flags)
return -EINVAL;
if (exec[i].alignment && !is_power_of_2(exec[i].alignment))
return -EINVAL;
/* First check for malicious input causing overflow in
* the worst case where we need to allocate the entire
* relocation tree as a single array.