Re: mm: use after free and panic in free_pages_and_swap_cache

From: Michal Hocko
Date: Wed Aug 12 2015 - 08:28:31 EST

On Mon 10-08-15 09:37:06, Sasha Levin wrote:
> Hi all,

Hi Sasha,

> While fuzzing with trinity inside a KVM tools guest running -next I've
> stumbled on the following:

Could post your config somewhere please? Or maybe just the disassemble
of free_pages_and_swap_cache and tlb_flush_mmu_free should be sufficient.

I am not sure I read the report properly. It all seem to point to
free_pages_and_swap_cache resp. tlb_flush_mmu_free but I fail to see
what could be wrong there. The last reference on the page should be
dropped in release_pages. The given pages array shouldn't be freed
behind our back as well because mmu_gather is local to this path.

Michal Hocko
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