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Date: Tue, 14 Aug 2018 18:04:18 -0700
From: dsahern@...nel.org
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, makita.toshiaki@....ntt.co.jp,
David Ahern <dsahern@...il.com>
Subject: [PATCH v2 net-next] veth: Free queues on link delete
From: David Ahern <dsahern@...il.com>
kmemleak reported new suspected memory leaks.
$ cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8800354d5c00 (size 1024):
comm "ip", pid 836, jiffies 4294722952 (age 25.904s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<(____ptrval____)>] kmemleak_alloc+0x70/0x94
[<(____ptrval____)>] slab_post_alloc_hook+0x42/0x52
[<(____ptrval____)>] __kmalloc+0x101/0x142
[<(____ptrval____)>] kmalloc_array.constprop.20+0x1e/0x26 [veth]
[<(____ptrval____)>] veth_newlink+0x147/0x3ac [veth]
...
unreferenced object 0xffff88002e009c00 (size 1024):
comm "ip", pid 836, jiffies 4294722958 (age 25.898s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<(____ptrval____)>] kmemleak_alloc+0x70/0x94
[<(____ptrval____)>] slab_post_alloc_hook+0x42/0x52
[<(____ptrval____)>] __kmalloc+0x101/0x142
[<(____ptrval____)>] kmalloc_array.constprop.20+0x1e/0x26 [veth]
[<(____ptrval____)>] veth_newlink+0x219/0x3ac [veth]
The allocations in question are veth_alloc_queues for the dev and its peer.
Free the queues on a delete.
Fixes: 638264dc90227 ("veth: Support per queue XDP ring")
Signed-off-by: David Ahern <dsahern@...il.com>
---
v2
- free peer dev queues as well
drivers/net/veth.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index e3202af72df5..2a3ce60631ef 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -1205,6 +1205,7 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
struct veth_priv *priv;
struct net_device *peer;
+ veth_free_queues(dev);
priv = netdev_priv(dev);
peer = rtnl_dereference(priv->peer);
@@ -1216,6 +1217,7 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
unregister_netdevice_queue(dev, head);
if (peer) {
+ veth_free_queues(peer);
priv = netdev_priv(peer);
RCU_INIT_POINTER(priv->peer, NULL);
unregister_netdevice_queue(peer, head);
--
2.11.0
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