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From ecc4fb6e1941035e1d9def1f69b779fbea216caf Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Mon, 24 Feb 2020 16:13:07 +0000
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Subject: [PATCH 7/9] qcow2: Fix qcow2_alloc_cluster_abort() for external data
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file
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20200224161307.29783-2-kwolf@redhat.com>
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Patchwork-id: 94042
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 1/1] qcow2: Fix qcow2_alloc_cluster_abort() for external data file
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Bugzilla: 1703907
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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For external data file, cluster allocations return an offset in the data
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file and are not refcounted. In this case, there is nothing to do for
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qcow2_alloc_cluster_abort(). Freeing the same offset in the qcow2 file
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is wrong and causes crashes in the better case or image corruption in
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the worse case.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Message-Id: <20200211094900.17315-3-kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit c3b6658c1a5a3fb24d6c27b2594cf86146f75b22)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/qcow2-cluster.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
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index 8982b7b..dc3c270 100644
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--- a/block/qcow2-cluster.c
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+++ b/block/qcow2-cluster.c
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@@ -1015,8 +1015,11 @@ err:
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void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m)
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{
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BDRVQcow2State *s = bs->opaque;
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- qcow2_free_clusters(bs, m->alloc_offset, m->nb_clusters << s->cluster_bits,
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- QCOW2_DISCARD_NEVER);
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+ if (!has_data_file(bs)) {
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+ qcow2_free_clusters(bs, m->alloc_offset,
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+ m->nb_clusters << s->cluster_bits,
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+ QCOW2_DISCARD_NEVER);
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+ }
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}
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/*
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--
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1.8.3.1
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