From: Max Reitz <mre...@redhat.com> A qcow2 image file's length is not required to have a length that is a multiple of the cluster size. However, qcow2_refcount_area() expects an aligned value for its @start_offset parameter, so we need to round @old_file_size up to the next cluster boundary.
Reported-by: Ping Li <pi...@redhat.com> Bug: https://bugzilla.redhat.com/show_bug.cgi?id=1414049 Signed-off-by: Max Reitz <mre...@redhat.com> Message-id: 20171009215533.12530-2-mre...@redhat.com Cc: qemu-sta...@nongnu.org Reviewed-by: Eric Blake <ebl...@redhat.com> Reviewed-by: Jeff Cody <jc...@redhat.com> Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> Signed-off-by: Max Reitz <mre...@redhat.com> (cherry picked from commit e400ad1e1f0127b4fdabcb1c8de1e99be91788df) Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com> --- block/qcow2.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/qcow2.c b/block/qcow2.c index a756bf9541..10e38074ad 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -3161,6 +3161,7 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, "Failed to inquire current file length"); return ret; } + old_file_size = ROUND_UP(old_file_size, s->cluster_size); nb_new_data_clusters = DIV_ROUND_UP(offset - old_length, s->cluster_size); -- 2.11.0
