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-rw-r--r--block/qcow2-cluster.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c
index 91d07f2203..8b2361a2ed 100644
--- a/block/qcow2-cluster.c
+++ b/block/qcow2-cluster.c
@@ -284,12 +284,15 @@ static int count_contiguous_clusters(uint64_t nb_clusters, int cluster_size,
uint64_t *l2_table, uint64_t start, uint64_t stop_flags)
{
int i;
- uint64_t mask = stop_flags | L2E_OFFSET_MASK;
- uint64_t offset = be64_to_cpu(l2_table[0]) & mask;
+ uint64_t mask = stop_flags | L2E_OFFSET_MASK | QCOW2_CLUSTER_COMPRESSED;
+ uint64_t first_entry = be64_to_cpu(l2_table[0]);
+ uint64_t offset = first_entry & mask;
if (!offset)
return 0;
+ assert(qcow2_get_cluster_type(first_entry) != QCOW2_CLUSTER_COMPRESSED);
+
for (i = start; i < start + nb_clusters; i++) {
uint64_t l2_entry = be64_to_cpu(l2_table[i]) & mask;
if (offset + (uint64_t) i * cluster_size != l2_entry) {