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qemu: Fix snapshot redefine vs. domain state bug

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The existing qemu snapshot code has a slight bug: if the domain
is currently pmsuspended, you can't use the _REDEFINE flag even
though the current domain state should have no bearing on being
able to recreate metadata state; and conversely, you can use the
_REDEFINE flag to create snapshot metadata claiming to be
pmsuspended as a bypass to the normal restrictions that you can't
create an original qemu snapshot in that state (the restriction
against pmsuspend is specific to qemu, rather than part of the
driver-agnostic snapshot_conf code).

Fix this by checking the snapshot state (when redefining) instead
of the domain state (which is a subset of snapshot states).

Fixes the second problem mentioned in https://bugzilla.redhat.com/1680304

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Eric Blake 2019-02-27 13:38:18 -06:00
parent 5de5432e34
commit 3926d0aa49
1 changed files with 7 additions and 2 deletions
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9
src/qemu/qemu_driver.c
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@ -15693,6 +15693,7 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
virQEMUDriverConfigPtr cfg = NULL;
virCapsPtr caps = NULL;
qemuDomainObjPrivatePtr priv;
virDomainState state;
virCheckFlags(VIR_DOMAIN_SNAPSHOT_CREATE_REDEFINE |
VIR_DOMAIN_SNAPSHOT_CREATE_CURRENT |
@ -15776,7 +15777,11 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
}
/* allow snapshots only in certain states */
switch ((virDomainState) vm->state.state) {
state = vm->state.state;
if (redefine)
state = def->state == VIR_DOMAIN_DISK_SNAPSHOT ? VIR_DOMAIN_SHUTOFF :
def->state;
switch (state) {
/* valid states */
case VIR_DOMAIN_RUNNING:
case VIR_DOMAIN_PAUSED:
@ -15796,7 +15801,7 @@ qemuDomainSnapshotCreateXML(virDomainPtr domain,
case VIR_DOMAIN_BLOCKED: /* invalid state, unused in qemu */
case VIR_DOMAIN_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR, _("Invalid domain state %s"),
virDomainStateTypeToString(vm->state.state));
virDomainStateTypeToString(state));
goto cleanup;
}