linux-kernel - [PATCH] virtio_console: fix a crash in config_work

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Message-Id: <1484390319-5252-1-git-send-email-gcampana@quarkslab.com>
Date:   Sat, 14 Jan 2017 11:38:39 +0100
From:   "G. Campana" <gcampana@...rkslab.com>
To:     Amit Shah <amit.shah@...hat.com>
Cc:     linux-kernel@...r.kernel.org, "G. Campana" <gcampana@...rkslab.com>
Subject: [PATCH] virtio_console: fix a crash in config_work_handler

Using control_work instead of config_work as the 3rd argument to
container_of results in an invalid portdev pointer. Indeed, the work
structure is initialized as below:

    INIT_WORK(&portdev->config_work, &config_work_handler);

It leads to a crash when portdev->vdev is dereferenced later. This bug
is triggered when the guest uses a virtio-console without multiport
feature and receives a config_changed virtio interrupt.
---
 drivers/char/virtio_console.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 8b00e79..17857be 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -1862,7 +1862,7 @@ static void config_work_handler(struct work_struct *work)
 {
 	struct ports_device *portdev;

-	portdev = container_of(work, struct ports_device, control_work);
+	portdev = container_of(work, struct ports_device, config_work);
 	if (!use_multiport(portdev)) {
 		struct virtio_device *vdev;
 		struct port *port;
-- 
2.7.4