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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>
This commit is contained in:
Max Reitz 2013-09-19 12:29:15 +02:00 committed by Stefan Hajnoczi
parent a9031675b9
commit 0f39ac9a07
1 changed files with 1 additions and 1 deletions
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2
block/qcow2-snapshot.c
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@ -192,7 +192,7 @@ static int qcow2_write_snapshots(BlockDriverState *bs)
/* The snapshot list position has not yet been updated, so these clusters
* must indeed be completely free */
ret = qcow2_pre_write_overlap_check(bs, QCOW2_OL_DEFAULT, offset,
s->snapshots_size);
snapshots_size);
if (ret < 0) {
return ret;
}