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Commit 6eae1538 authored by Jiri Denemark's avatar Jiri Denemark Committed by Eric Blake
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qemu: Avoid using stale data in virDomainGetBlockInfo

CVE-2013-6458

Generally, every API that is going to begin a job should do that before
fetching data from vm->def. However, qemuDomainGetBlockInfo does not
know whether it will have to start a job or not before checking vm->def.
To avoid using disk alias that might have been freed while we were
waiting for a job, we use its copy. In case the disk was removed in the
meantime, we will fail with "cannot find statistics for device '...'"
error message.

(cherry picked from commit b7992595)
parent 938ef6e6
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