[Qemu-devel] [PATCH 1/5] qcow2: reject unaligned offsets in write compressed

[Anton Nefedov]

Misaligned compressed write is not supported.

Signed-off-by: Anton Nefedov <anton.nefe...@virtuozzo.com>
---
 block/qcow2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/qcow2.c b/block/qcow2.c
index 92cb9f9..45c5651 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3349,6 +3349,10 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, 
uint64_t offset,
         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 ||
-- 
2.7.4