qcow2: Fix src_offset in copy offloading

Not updating src_offset will result in wrong data being written to dst
image.

Reported-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/block/qcow2.c b/block/qcow2.c
index 286640c0e3..2f9e58e0c4 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3387,6 +3387,7 @@ qcow2_co_copy_range_to(BlockDriverState *bs,
         }
 
         bytes -= cur_bytes;
+        src_offset += cur_bytes;
         dst_offset += cur_bytes;
     }
     ret = 0;