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drm/msm: Don't allow zero sized buffer objects 

Zero sized buffer objects tend to make various bits of the GEM
infrastructure complain:

 WARNING: CPU: 1 PID: 2323 at drivers/gpu/drm/drm_mm.c:389 drm_mm_insert_node_generic+0x258/0x2f0
 Modules linked in:

 CPU: 1 PID: 2323 Comm: drm-api-test Tainted: G        W 4.9.0-rc4-00906-g693af44 #213
 Hardware name: Qualcomm Technologies, Inc. DB820c (DT)
 task: ffff8000d7353400 task.stack: ffff8000d7720000
 PC is at drm_mm_insert_node_generic+0x258/0x2f0
 LR is at drm_vma_offset_add+0x4c/0x70

Zero sized buffers serve no appreciable value to the user so disallow
them at create time.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse 2017-03-07 10:02:51 -07:00 committed by Rob Clark
parent f456d348b6
commit 1a5dff5d74
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/msm/msm_gem.c
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@ -812,6 +812,12 @@ struct drm_gem_object *msm_gem_new(struct drm_device *dev,
size = PAGE_ALIGN(size);
/* Disallow zero sized objects as they make the underlying
* infrastructure grumpy
*/
if (size == 0)
return ERR_PTR(-EINVAL);
ret = msm_gem_new_impl(dev, size, flags, NULL, &obj);
if (ret)
goto fail;