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authorAmit Shah <amit.shah@redhat.com>2010-02-12 10:32:15 +0530
committerRusty Russell <rusty@rustcorp.com.au>2010-02-24 14:23:03 +1030
commita9cdd4855738906043b8131cfe8055d6cde88ffe (patch)
tree37ce268d3aceb90145d6d42d29b1f77a5bc1005f /drivers/char
parent298add723aecd7af461319fe815d935ef2c40d78 (diff)
virtio: console: Ensure no memleaks in case of unused buffers
If unused data exists in in_vq, ensure we flush that first and then detach unused buffers, which will ensure all buffers from the in_vq are removed. Also ensure we free the buffers after detaching them. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/virtio_console.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index a3f1f73bac3..69d2e616dd0 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -838,6 +838,8 @@ static const struct file_operations port_debugfs_ops = {
/* Remove all port-specific data. */
static int remove_port(struct port *port)
{
+ struct port_buffer *buf;
+
spin_lock_irq(&port->portdev->ports_lock);
list_del(&port->list);
spin_unlock_irq(&port->portdev->ports_lock);
@@ -851,14 +853,17 @@ static int remove_port(struct port *port)
if (port->guest_connected)
send_control_msg(port, VIRTIO_CONSOLE_PORT_OPEN, 0);
- while (port->in_vq->vq_ops->detach_unused_buf(port->in_vq))
- ;
-
sysfs_remove_group(&port->dev->kobj, &port_attribute_group);
device_destroy(pdrvdata.class, port->dev->devt);
cdev_del(&port->cdev);
+ /* Remove unused data this port might have received. */
discard_port_data(port);
+
+ /* Remove buffers we queued up for the Host to send us data in. */
+ while ((buf = port->in_vq->vq_ops->detach_unused_buf(port->in_vq)))
+ free_buf(buf);
+
kfree(port->name);
debugfs_remove(port->debugfs_file);