On Mon, Aug 19, 2013 at 09:59:14AM +0300, Dan Carpenter wrote:
> Hello Ben Widawsky,
>
> Here is another use after free warning. It's some new static checker
> stuff that I haven't pushed because it has lots of false postives.
>
> The patch f7795b1d0b47: "drm/i915: Switch eviction code to use vmas"
> from Aug 14, 2013, leads to the following warning:
> "drivers/gpu/drm/i915/i915_gem_evict.c:145 i915_gem_evict_something()
> warn: 'vma' was already freed."
>
>
> drivers/gpu/drm/i915/i915_gem_evict.c
> 137 /* Unbinding will emit any required flushes */
> 138 while (!list_empty(&eviction_list)) {
> 139 vma = list_first_entry(&eviction_list,
> 140 struct i915_vma,
> 141 exec_list);
> 142 if (ret == 0)
> 143 ret = i915_vma_unbind(vma);
> ^^^^^^^^^^^^^^^^^^^^
> This often frees the "vma".
>
> 144
> 145 list_del_init(&vma->exec_list);
> ^^^^^^^^^^^^^^^
> Dereference.
>
> 146 drm_gem_object_unreference(&vma->obj->base);
> 147 }
Correct. Patch is en route already, thanks.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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