qcow2: add overlap check for bitmap directory

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20180705151515.779173-1-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 18c729aa27..1b9ecb1ca0 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -2705,6 +2705,16 @@ int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
         }
     }
 
+    if ((chk & QCOW2_OL_BITMAP_DIRECTORY) &&
+        (s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS))
+    {
+        if (overlaps_with(s->bitmap_directory_offset,
+                          s->bitmap_directory_size))
+        {
+            return QCOW2_OL_BITMAP_DIRECTORY;
+        }
+    }
+
     return 0;
 }