From 3ede935fdbbd5f7b24b4724bbfb8938acb5956d8 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 25 Feb 2020 15:31:28 +0100 Subject: [PATCH] qcow2: Fix alloc_cluster_abort() for pre-existing clusters handle_alloc() reuses preallocated zero clusters. If anything goes wrong during the data write, we do not change their L2 entry, so we must not let qcow2_alloc_cluster_abort() free them. Fixes: 8b24cd141549b5b264baeddd4e72902cfb5de23b Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz Message-Id: <20200225143130.111267-2-mreitz@redhat.com> Signed-off-by: Kevin Wolf --- block/qcow2-cluster.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 78c95dfa16..17f1363279 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1026,7 +1026,7 @@ err: void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m) { BDRVQcow2State *s = bs->opaque; - if (!has_data_file(bs)) { + if (!has_data_file(bs) && !m->keep_old_clusters) { qcow2_free_clusters(bs, m->alloc_offset, m->nb_clusters << s->cluster_bits, QCOW2_DISCARD_NEVER);