[Qemu-devel] [PULL 17/25] qcow2: reject unaligned offsets in write compressed

[Kevin Wolf <kwolf@redhat.com>]

From: Anton Nefedov <anton.nefedov@virtuozzo.com>

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>
---
 block/qcow2.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/block/qcow2.c b/block/qcow2.c
index f2731a7cb5..811b913233 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3358,6 +3358,10 @@ 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 ||
-- 
2.13.6