This is a note to let you know that I've just added the patch titled
macvlan: Fix device ref leak when purging bc_queue
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
macvlan-fix-device-ref-leak-when-purging-bc_queue.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Apr 30 15:46:17 CEST 2017
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 20 Apr 2017 20:55:12 +0800
Subject: macvlan: Fix device ref leak when purging bc_queue
From: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
[ Upstream commit f6478218e6edc2a587b8f132f66373baa7b2497c ]
When a parent macvlan device is destroyed we end up purging its
broadcast queue without dropping the device reference count on
the packet source device. This causes the source device to linger.
This patch drops that reference count.
Fixes: 260916dfb48c ("macvlan: Fix potential use-after free for...")
Reported-by: Joe Ghalam <Joe.Ghalam@xxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/macvlan.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1110,6 +1110,7 @@ static int macvlan_port_create(struct ne
static void macvlan_port_destroy(struct net_device *dev)
{
struct macvlan_port *port = macvlan_port_get_rtnl(dev);
+ struct sk_buff *skb;
dev->priv_flags &= ~IFF_MACVLAN_PORT;
netdev_rx_handler_unregister(dev);
@@ -1118,7 +1119,15 @@ static void macvlan_port_destroy(struct
* but we need to cancel it and purge left skbs if any.
*/
cancel_work_sync(&port->bc_work);
- __skb_queue_purge(&port->bc_queue);
+
+ while ((skb = __skb_dequeue(&port->bc_queue))) {
+ const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
+
+ if (src)
+ dev_put(src->dev);
+
+ kfree_skb(skb);
+ }
kfree_rcu(port, rcu);
}
Patches currently in stable-queue which might be from herbert@xxxxxxxxxxxxxxxxxxx are
queue-4.4/macvlan-fix-device-ref-leak-when-purging-bc_queue.patch
queue-4.4/crypto-testmgr-fix-out-of-bound-read-in-__test_aead.patch