qcow2: Don't ignore qcow2_alloc_clusters return value

Now that qcow2_alloc_clusters can return error codes, we must handle them in
the callers of qcow2_alloc_clusters.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index b12299d..2fdc26b 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -435,6 +435,9 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
     assert(size > 0 && size <= s->cluster_size);
     if (s->free_byte_offset == 0) {
         s->free_byte_offset = qcow2_alloc_clusters(bs, s->cluster_size);
+        if (s->free_byte_offset < 0) {
+            return s->free_byte_offset;
+        }
     }
  redo:
     free_in_cluster = s->cluster_size -
@@ -450,6 +453,9 @@ int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size)
             update_cluster_refcount(bs, offset >> s->cluster_bits, 1);
     } else {
         offset = qcow2_alloc_clusters(bs, s->cluster_size);
+        if (offset < 0) {
+            return offset;
+        }
         cluster_offset = s->free_byte_offset & ~(s->cluster_size - 1);
         if ((cluster_offset + s->cluster_size) == offset) {
             /* we are lucky: contiguous data */