[Qemu-devel] [PATCH 2/3] qcow2: Free allocated L2 cluster on error

[Max Reitz]

If an error occurs in l2_allocate, the allocated (but unused) L2 cluster
should be freed.

Signed-off-by: Max Reitz <mre...@redhat.com>
---
 block/qcow2-cluster.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index f6d47c9..1c3d3fc 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -269,6 +269,10 @@ fail:
         qcow2_cache_put(bs, s->l2_table_cache, (void**) table);
     }
     s->l1_table[l1_index] = old_l2_offset;
+    if (l2_offset > 0) {
+        qcow2_free_clusters(bs, l2_offset, s->l2_size * sizeof(uint64_t),
+                            QCOW2_DISCARD_ALWAYS);
+    }
     return ret;
 }
 
-- 
1.8.3.1