[Xen-devel] [PATCH v2 1/2] xen-netback: fix memory leaks on XenBus disconnect

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

Eliminate memory leaks introduced several years ago by cleaning the
queue resources which are allocated on XenBus connection event. Namely, queue
structure array and pages used for IO rings.

Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
---
 drivers/net/xen-netback/xenbus.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 6c57b02..3e99071 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -493,11 +493,20 @@ static int backend_create_xenvif(struct backend_info *be)
 static void backend_disconnect(struct backend_info *be)
 {
        if (be->vif) {
+               unsigned int queue_index;
+
                xen_unregister_watchers(be->vif);
 #ifdef CONFIG_DEBUG_FS
                xenvif_debugfs_delif(be->vif);
 #endif /* CONFIG_DEBUG_FS */
                xenvif_disconnect_data(be->vif);
+               for (queue_index = 0; queue_index < be->vif->num_queues; 
++queue_index)
+                       xenvif_deinit_queue(&be->vif->queues[queue_index]);
+
+               vfree(be->vif->queues);
+               be->vif->num_queues = 0;
+               be->vif->queues = NULL;
+
                xenvif_disconnect_ctrl(be->vif);
        }
 }
@@ -1026,6 +1035,8 @@ static void connect(struct backend_info *be)
 err:
        if (be->vif->num_queues > 0)
                xenvif_disconnect_data(be->vif); /* Clean up existing queues */
+       for (queue_index = 0; queue_index < be->vif->num_queues; ++queue_index)
+               xenvif_deinit_queue(&be->vif->queues[queue_index]);
        vfree(be->vif->queues);
        be->vif->queues = NULL;
        be->vif->num_queues = 0;
-- 
1.8.3.1


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