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Date: Sun, 30 Aug 2020 06:13:36 -0700 From: Rustam Kovhaev <rkovhaev@...il.com> To: davem@...emloft.net, kuba@...nel.org Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org, Rustam Kovhaev <rkovhaev@...il.com> Subject: [PATCH] veth: fix memory leak in veth_newlink() when register_netdevice(dev) fails we should check whether struct veth_rq has been allocated via ndo_init callback and free it, because, depending on the code path, register_netdevice() might not call priv_destructor() callback Reported-and-tested-by: syzbot+59ef240dd8f0ed7598a8@...kaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=59ef240dd8f0ed7598a8 Signed-off-by: Rustam Kovhaev <rkovhaev@...il.com> --- drivers/net/veth.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index a475f48d43c4..e40ca62a046a 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -1394,7 +1394,9 @@ static int veth_newlink(struct net *src_net, struct net_device *dev, return 0; err_register_dev: - /* nothing to do */ + priv = netdev_priv(dev); + if (priv->rq) + veth_dev_free(dev); err_configure_peer: unregister_netdevice(peer); return err; -- 2.28.0
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