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| author | Max Reitz <mreitz@redhat.com> | 2013-09-19 12:29:15 +0200 |
|---|---|---|
| committer | Stefan Hajnoczi <stefanha@redhat.com> | 2013-09-20 12:48:03 +0200 |
| commit | 0f39ac9a07cc10278e37d87076b143008f28aa3b (patch) | |
| tree | f91b54819320711a4ffda49d5542291fb58f0cd7 | |
| parent | a9031675b9f757eef0fe8c99284ec0133c032c32 (diff) | |
| download | qemu-0f39ac9a07cc10278e37d87076b143008f28aa3b.zip qemu-0f39ac9a07cc10278e37d87076b143008f28aa3b.tar.gz qemu-0f39ac9a07cc10278e37d87076b143008f28aa3b.tar.bz2 | |
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>
| -rw-r--r-- | block/qcow2-snapshot.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index 7d14420..5e8a779 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -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; } |