qcow2: Check L1 table offset in qcow2_snapshot_load_tmp()
This function checks that the size of a snapshot's L1 table is not too large, but it doesn't validate the offset. We now have a function to take care of this, so let's use it. Signed-off-by: NAlberto Garcia <berto@igalia.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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