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qemuDomainAttachDiskGenericTransient: Add NULL check in case the overlay disk already exists 

When <transient shareBacking='yes'> is set to a disk and the overlay
disk already exists because of something abnormal, libvirt is terminated
by Segmentation fault.

  # virsh start Test0
  error: Disconnected from qemu:///system due to end of file
  error: Failed to start domain 'Test0'
  error: End of file while reading data: Input/output error

Add NULL check for snapdiskdef so that the rollback can work correctly.

Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
Fixes: 2e94002d2a
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Signed-off-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Masayoshi Mizuma 2021-05-26 16:19:22 -04:00 committed by Ján Tomko
parent b1164a8e68
commit e2373bd27f
1 changed files with 3 additions and 1 deletions
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4
src/qemu/qemu_hotplug.c
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@ -695,7 +695,9 @@ qemuDomainAttachDiskGenericTransient(virDomainObj *vm,
g_autoptr(qemuSnapshotDiskContext) snapctxt = NULL;
g_autoptr(virDomainSnapshotDiskDef) snapdiskdef = NULL;
snapdiskdef = qemuSnapshotGetTransientDiskDef(disk, vm->def->name);
if (!(snapdiskdef = qemuSnapshotGetTransientDiskDef(disk, vm->def->name)))
return NULL;
snapctxt = qemuSnapshotDiskContextNew(1, vm, asyncJob);
if (qemuSnapshotDiskPrepareOne(snapctxt, disk, snapdiskdef,