From: Pavel Butsykin <pbutsykin@virtuozzo.com>
Date: Mon, 15 Aug 2016 09:39:22 +0000 (+0300)
Subject: qcow2: fix iovec size at qcow2_co_pwritev_compressed
X-Git-Tag: v2.8.0-rc0~158^2~5
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8b2bd09338ae44e35a46e324cda566dbf17fc21c;p=qemu-xen-unstable.git

qcow2: fix iovec size at qcow2_co_pwritev_compressed

Use bytes as the size would be more exact than s->cluster_size.  Although
qemu_iovec_to_buf() will not allow to go beyond the qiov.

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---

diff --git a/block/qcow2.c b/block/qcow2.c
index adf451491f..c079aa83b6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2565,7 +2565,7 @@ qcow2_co_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
         /* Zero-pad last write if image size is not cluster aligned */
         memset(buf + bytes, 0, s->cluster_size - bytes);
     }
-    qemu_iovec_to_buf(qiov, 0, buf, s->cluster_size);
+    qemu_iovec_to_buf(qiov, 0, buf, bytes);
 
     out_buf = g_malloc(s->cluster_size);