linux-kernel - Re: [PATCH] net-veth: Fix memleak in veth

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Message-ID: <20201022091211.2a86355c@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Thu, 22 Oct 2020 09:12:11 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, "David S. Miller" <davem@...emloft.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net-veth: Fix memleak in veth_newlink

On Thu, 22 Oct 2020 13:42:33 +0800 Dinghao Liu wrote:
> When rtnl_configure_link() fails, peer needs to be
> freed just like when register_netdevice() fails.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>

Can you see this leak or are you just sending this based on your
reading of the code?

netdev should be freed by the core:

static void veth_setup(struct net_device *dev)                                  
{                                                                               
        ether_setup(dev);                                                       
                                                                                
	[...]                    
        dev->needs_free_netdev = true;    

> diff --git a/drivers/net/veth.c b/drivers/net/veth.c
> index 8c737668008a..6c68094399cc 100644
> --- a/drivers/net/veth.c
> +++ b/drivers/net/veth.c
> @@ -1405,8 +1405,6 @@ static int veth_newlink(struct net *src_net, struct net_device *dev,
>  	/* nothing to do */
>  err_configure_peer:
>  	unregister_netdevice(peer);
> -	return err;
> -
>  err_register_peer:
>  	free_netdev(peer);
>  	return err;