Re: [Qemu-devel] [PATCH 0/4] Misc qcow2 corruption checks

[Max Reitz <mreitz@redhat.com>]

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On 2017-11-01 16:42, Alberto Garcia wrote:
> Misc qcow2 corruption checks
> 
> This series contains a few checks that prevent QEMU from crashing
> under some scenarios with corrupted qcow2 images.
> 
> The first patch solves the crash reported here:
> 
>   https://bugs.launchpad.net/qemu/+bug/1728615
> 
> And the others solve similar crashes that I detected in the process of
> fixing this one.
> 
> Regards,
> 
> Berto

There are two more cases which might need a check that the return value
of an allocation function isn't 0:

The first is qcow2_alloc_bytes() which has an assert(offset) after
potentially setting offset = new_cluster (with new_cluster being the
return value of alloc_clusters_noref()).

The second is qcow2_crypto_hdr_init_func() which is simply missing a
pre-write overlap check.

The rest (besides L2 table and refblock allocation) should be guarded by
the pre-write overlap check.

Do you want to fix these or do we need another volunteer? :-)

Max


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