qcow2: reject unaligned offsets in write compressed
Misaligned compressed write is not supported.
Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Message-id: 1510654613-47868-2-git-send-email-anton.nefedov@virtuozzo.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
diff --git a/block/qcow2.c b/block/qcow2.c
index f2731a7..811b913 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3358,6 +3358,10 @@
return bdrv_truncate(bs->file, cluster_offset, PREALLOC_MODE_OFF, NULL);
}
+ if (offset_into_cluster(s, offset)) {
+ return -EINVAL;
+ }
+
buf = qemu_blockalign(bs, s->cluster_size);
if (bytes != s->cluster_size) {
if (bytes > s->cluster_size ||
