linux-kernel - [Xen PATCH] xen-netback: fix error handling output

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Date:   Tue,  8 Nov 2016 14:34:34 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     David Vrabel <david.vrabel@...rix.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Wei Liu <wei.liu2@...rix.com>,
        Paul Durrant <paul.durrant@...rix.com>,
        "David S. Miller" <davem@...emloft.net>,
        Juergen Gross <jgross@...e.com>,
        Filipe Manco <filipe.manco@...lab.eu>,
        xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [Xen PATCH] xen-netback: fix error handling output

The connect function prints an unintialized error code after an
earlier initialization was removed:

drivers/net/xen-netback/xenbus.c: In function 'connect':
drivers/net/xen-netback/xenbus.c:938:3: error: 'err' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This prints it as -EINVAL instead, which seems to be the most
appropriate error code. Before the patch that caused the warning,
this would print a positive number returned by vsscanf() instead,
which is also wrong. We probably don't need a backport though,
as fixing the warning here should be sufficient.

Fixes: f95842e7a9f2 ("xen: make use of xenbus_read_unsigned() in xen-netback")
Fixes: 8d3d53b3e433 ("xen-netback: Add support for multiple queues")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/net/xen-netback/xenbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 7356e00fac54..bfed79877b8a 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -935,7 +935,7 @@ static void connect(struct backend_info *be)
 					"multi-queue-num-queues", 1);
 	if (requested_num_queues > xenvif_max_queues) {
 		/* buggy or malicious guest */
-		xenbus_dev_fatal(dev, err,
+		xenbus_dev_fatal(dev, -EINVAL,
 				 "guest requested %u queues, exceeding the maximum of %u.",
 				 requested_num_queues, xenvif_max_queues);
 		return;
-- 
2.9.0