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@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index f4fb2bd33753..b14733908d8d 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1189,6 +1189,9 @@ validate_exec_list(const struct drm_i915_gem_execbuffer2 *args,
if (exec[i].flags & invalid_flags)
return -EINVAL;
+ if (exec[i].alignment && !is_power_of_2(exec[i].alignment))
+ return -EINVAL;
+
/* pad_to_size was once a reserved field, so sanitize it */
if (exec[i].flags & EXEC_OBJECT_PAD_TO_SIZE) {
if (offset_in_page(exec[i].pad_to_size))
--
2.1.4
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