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qcow2: Fix qcow2_alloc_cluster_abort() for external data file

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For external data file, cluster allocations return an offset in the data
file and are not refcounted. In this case, there is nothing to do for
qcow2_alloc_cluster_abort(). Freeing the same offset in the qcow2 file
is wrong and causes crashes in the better case or image corruption in
the worse case.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200211094900.17315-3-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2020-02-11 10:48:59 +01:00
parent dea9052ef1
commit c3b6658c1a
1 changed files with 5 additions and 2 deletions
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5
block/qcow2-cluster.c
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@ -1026,9 +1026,12 @@ err:
void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m)
{
BDRVQcow2State *s = bs->opaque;
qcow2_free_clusters(bs, m->alloc_offset, m->nb_clusters << s->cluster_bits,
if (!has_data_file(bs)) {
qcow2_free_clusters(bs, m->alloc_offset,
m->nb_clusters << s->cluster_bits,
QCOW2_DISCARD_NEVER);
}
}
/*
* Returns the number of contiguous clusters that can be used for an allocating