netdev - Re: [PATCH net-next] ip6_vti: fix memleak on netns dismantle

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Message-ID: <20240416140350.GN2320920@kernel.org>
Date: Tue, 16 Apr 2024 15:03:50 +0100
From: Simon Horman <horms@...nel.org>
To: Florian Westphal <fw@...len.de>
Cc: netdev@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Breno Leitao <leitao@...ian.org>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH net-next] ip6_vti: fix memleak on netns dismantle

+ Steffen Klassert, Herbert Xu, David Ahern

On Mon, Apr 15, 2024 at 02:23:44PM +0200, Florian Westphal wrote:
> kmemleak reports net_device resources are no longer released, restore
> needs_free_netdev toggle.  Sample backtrace:
> 
> unreferenced object 0xffff88810874f000 (size 4096): [..]
>     [<00000000a2b8af8b>] __kmalloc_node+0x209/0x290
>     [<0000000040b0a1a9>] alloc_netdev_mqs+0x58/0x470
>     [<00000000b4be1e78>] vti6_init_net+0x94/0x230
>     [<000000008830c1ea>] ops_init+0x32/0xc0
>     [<000000006a26fa8f>] setup_net+0x134/0x2e0
> [..]
> 
> Cc: Breno Leitao <leitao@...ian.org>
> Fixes: a9b2d55a8f1e ("ip6_vti: Do not use custom stat allocator")
> Signed-off-by: Florian Westphal <fw@...len.de>

Reviewed-by: Simon Horman <horms@...nel.org>

> ---
>  net/ipv6/ip6_vti.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
> index 4d68a0777b0c..78344cf3867e 100644
> --- a/net/ipv6/ip6_vti.c
> +++ b/net/ipv6/ip6_vti.c
> @@ -901,6 +901,7 @@ static void vti6_dev_setup(struct net_device *dev)
>  {
>  	dev->netdev_ops = &vti6_netdev_ops;
>  	dev->header_ops = &ip_tunnel_header_ops;
> +	dev->needs_free_netdev = true;
>  
>  	dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
>  	dev->type = ARPHRD_TUNNEL6;
> -- 
> 2.43.2
> 
>