From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755238AbdDMR6I (ORCPT ); Thu, 13 Apr 2017 13:58:08 -0400 Received: from mail.kernel.org ([198.145.29.136]:37514 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753807AbdDMR6G (ORCPT ); Thu, 13 Apr 2017 13:58:06 -0400 From: Stefano Stabellini To: xen-devel@lists.xen.org Cc: linux-kernel@vger.kernel.org, sstabellini@kernel.org, Stefano Stabellini , dan.carpenter@oracle.com, jgross@suse.com, boris.ostrovsky@oracle.com, Eric Van Hensbergen , Ron Minnich , Latchesar Ionkov , v9fs-developer@lists.sourceforge.net Subject: [PATCH] xen/9pfs: initialize len to 0 to detect xenbus_read errors Date: Thu, 13 Apr 2017 10:57:56 -0700 Message-Id: <1492106276-13505-1-git-send-email-sstabellini@kernel.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In order to use "len" to check for xenbus_read errors properly, we need to initialize len to 0 before passing it to xenbus_read. Signed-off-by: Stefano Stabellini CC: dan.carpenter@oracle.com CC: jgross@suse.com CC: boris.ostrovsky@oracle.com CC: Eric Van Hensbergen CC: Ron Minnich CC: Latchesar Ionkov CC: v9fs-developer@lists.sourceforge.net --- Juergen, you could also merge this patch into commit e9c53da56ff36458b1b8df95573f5dac80a1a956 --- --- net/9p/trans_xen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/9p/trans_xen.c b/net/9p/trans_xen.c index 4786424..71e8564 100644 --- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -386,7 +386,7 @@ static int xen_9pfs_front_probe(struct xenbus_device *dev, struct xenbus_transaction xbt; struct xen_9pfs_front_priv *priv = NULL; char *versions; - unsigned int max_rings, max_ring_order, len; + unsigned int max_rings, max_ring_order, len = 0; versions = xenbus_read(XBT_NIL, dev->otherend, "versions", &len); if (!len) -- 1.9.1