Current code will return 0 on this write_sync fail, as rc is 0
after successful nbd_negotiate_options. Fix this.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 nbd/server.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/nbd/server.c b/nbd/server.c
index 3d4cd3d21c..984fad4bdb 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -607,7 +607,8 @@ static coroutine_fn int nbd_negotiate(NBDClient *client)
         stq_be_p(buf + 18, client->exp->size);
         stw_be_p(buf + 26, client->exp->nbdflags | myflags);
         len = client->no_zeroes ? 10 : sizeof(buf) - 18;
-        if (write_sync(client->ioc, buf + 18, len, NULL) < 0) {
+        rc = write_sync(client->ioc, buf + 18, len, NULL);
+        if (rc < 0) {
             LOG("write failed");
             goto fail;
         }
-- 
2.11.1

On 05/30/2017 09:30 AM, Vladimir Sementsov-Ogievskiy wrote:
> Current code will return 0 on this write_sync fail, as rc is 0
> after successful nbd_negotiate_options. Fix this.
> 
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> ---
>  nbd/server.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 

Reviewed-by: Eric Blake <eblake@redhat.com>

> diff --git a/nbd/server.c b/nbd/server.c
> index 3d4cd3d21c..984fad4bdb 100644
> --- a/nbd/server.c
> +++ b/nbd/server.c
> @@ -607,7 +607,8 @@ static coroutine_fn int nbd_negotiate(NBDClient *client)
>          stq_be_p(buf + 18, client->exp->size);
>          stw_be_p(buf + 26, client->exp->nbdflags | myflags);
>          len = client->no_zeroes ? 10 : sizeof(buf) - 18;
> -        if (write_sync(client->ioc, buf + 18, len, NULL) < 0) {
> +        rc = write_sync(client->ioc, buf + 18, len, NULL);
> +        if (rc < 0) {
>              LOG("write failed");
>              goto fail;
>          }
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org