Signed-off-by: Wenchao Xia <xiaw...@linux.vnet.ibm.com>
---
block/qcow2-snapshot.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c
index 4bd494b..c933b7f 100644
--- a/block/qcow2-snapshot.c
+++ b/block/qcow2-snapshot.c
@@ -304,6 +304,13 @@ static int qcow2_write_snapshots(BlockDriverState *bs,
Error **errp)
PRIi64 " with size %" PRIu64 ":%d (%s)",
offsetof(QCowHeader, nb_snapshots), sizeof(header_data),
ret, strerror(-ret));
+ /*
+ * If the snapshot data part have been updated on disk, Then the
+ * clusters at snapshot_offset may be used in next snapshot operation.
+ * If we free those clusters in fail path, they may be allocated and
+ * made dirty causing damage, so skip cluster free for safe.
+ */
+ snapshots_offset = 0;
goto fail;
}
--
1.7.1
