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drm/i915/userptr: reject zero user_size

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Operating on a zero sized GEM userptr object will lead to explosions.

Fixes: 5cc9ed4b9a ("drm/i915: Introduce mapping of user pages into video memory (userptr) ioctl")
Testcase: igt/gem_userptr_blits/input-checking
Signed-off-by: Matthew Auld <[email protected]>
Cc: Chris Wilson <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit c11c7bfd21)
Signed-off-by: Joonas Lahtinen <[email protected]>
This commit is contained in:
Matthew Auld 2018-05-02 20:50:21 +01:00 • committed by Joonas Lahtinen
commit 20943f9849
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_gem_userptr.c
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@ -778,6 +778,9 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
I915_USERPTR_UNSYNCHRONIZED))
return -EINVAL;
if (!args->user_size)
return -EINVAL;
if (offset_in_page(args->user_ptr | args->user_size))
return -EINVAL;