tree f91b54819320711a4ffda49d5542291fb58f0cd7
parent a9031675b9f757eef0fe8c99284ec0133c032c32
author Max Reitz <mreitz@redhat.com> 1379586555 +0200
committer Stefan Hajnoczi <stefanha@redhat.com> 1379674083 +0200

qcow2: Correct snapshots size for overlap check

Using s->snapshots_size instead of snapshots_size for the metadata
overlap check in qcow2_write_snapshots leads to the detection of an
overlap with the main qcow2 image header when deleting the last
snapshot, since s->snapshots_size has not yet been updated and is
therefore non-zero. However, the offset returned by qcow2_alloc_clusters
will be zero since snapshots_size is zero. Therefore, an overlap is
detected albeit no such will occur.

This patch fixes this by replacing s->snapshots_size by snapshots_size
when calling qcow2_pre_write_overlap_check.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>