diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2020-02-11 10:48:59 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-02-18 10:53:56 +0100 |
| commit | c3b6658c1a5a3fb24d6c27b2594cf86146f75b22 (patch) | |
| tree | 40a4b799ffa403c07ae3046aabff5c1c86cd5929 | |
| parent | dea9052ef1ba12c83f17d394c70d7d710ea1dec9 (diff) | |
qcow2: Fix qcow2_alloc_cluster_abort() for external data file
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>
| -rw-r--r-- | block/qcow2-cluster.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 1947f13a2d..78c95dfa16 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1026,8 +1026,11 @@ 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, - QCOW2_DISCARD_NEVER); + if (!has_data_file(bs)) { + qcow2_free_clusters(bs, m->alloc_offset, + m->nb_clusters << s->cluster_bits, + QCOW2_DISCARD_NEVER); + } } /* |