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From 7ec94ee16262eb0da7fb7788347a65162845b1c2 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 10 Oct 2018 13:19:57 +0100
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Subject: [PATCH 3/5] mirror: Fail gracefully for source == target
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20181010131957.23198-2-kwolf@redhat.com>
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Patchwork-id: 82564
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O-Subject: [RHEL-8 qemu-kvm PATCH 1/1] mirror: Fail gracefully for source == target
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Bugzilla: 1637963
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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blockdev-mirror with the same node for source and target segfaults
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today: A node is in its own backing chain, so mirror_start_job() decides
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that this is an active commit. When adding the intermediate nodes with
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block_job_add_bdrv(), it starts the iteration through the subchain with
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the backing file of source, though, so it never reaches target and
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instead runs into NULL at the base.
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While we could fix that by starting with source itself, there is no
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point in allowing mirroring a node into itself and I wouldn't be
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surprised if this caused more problems later.
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So just check for this scenario and error out.
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Cc: qemu-stable@nongnu.org
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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(cherry picked from commit 86fae10c64d642256cf019e6829929fa0d259c7a)
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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/mirror.c | 5 +++++
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tests/qemu-iotests/041 | 6 ++++++
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tests/qemu-iotests/041.out | 4 ++--
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3 files changed, 13 insertions(+), 2 deletions(-)
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diff --git a/block/mirror.c b/block/mirror.c
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index 163b1d4..313e6e9 100644
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--- a/block/mirror.c
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+++ b/block/mirror.c
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@@ -1149,6 +1149,11 @@ static void mirror_start_job(const char *job_id, BlockDriverState *bs,
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buf_size = DEFAULT_MIRROR_BUF_SIZE;
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}
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+ if (bs == target) {
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+ error_setg(errp, "Can't mirror node into itself");
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+ return;
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+ }
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+
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/* In the case of active commit, add dummy driver to provide consistent
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* reads on the top, while disabling it in the intermediate nodes, and make
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* the backing chain writable. */
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diff --git a/tests/qemu-iotests/041 b/tests/qemu-iotests/041
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index c20ac7d..9336ab6 100755
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--- a/tests/qemu-iotests/041
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+++ b/tests/qemu-iotests/041
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@@ -234,6 +234,12 @@ class TestSingleBlockdev(TestSingleDrive):
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result = self.vm.qmp("blockdev-add", **args)
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self.assert_qmp(result, 'return', {})
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+ def test_mirror_to_self(self):
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+ result = self.vm.qmp(self.qmp_cmd, job_id='job0',
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+ device=self.qmp_target, sync='full',
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+ target=self.qmp_target)
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+ self.assert_qmp(result, 'error/class', 'GenericError')
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+
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test_large_cluster = None
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test_image_not_found = None
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test_small_buffer2 = None
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diff --git a/tests/qemu-iotests/041.out b/tests/qemu-iotests/041.out
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index c28b392..e071d0b 100644
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--- a/tests/qemu-iotests/041.out
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+++ b/tests/qemu-iotests/041.out
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@@ -1,5 +1,5 @@
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-.....................................................................................
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+........................................................................................
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----------------------------------------------------------------------
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-Ran 85 tests
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+Ran 88 tests
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OK
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--
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1.8.3.1
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