netdev - Re: [PATCH net] net: sched: act_tunnel_key: fix NULL pointer dereference during init

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Date:   Mon, 25 Feb 2019 16:36:26 +0100
From:   Davide Caratti <dcaratti@...hat.com>
To:     Vlad Buslov <vladbu@...lanox.com>, netdev@...r.kernel.org
Cc:     jhs@...atatu.com, xiyou.wangcong@...il.com, jiri@...nulli.us,
        davem@...emloft.net, wenxu@...oud.cn, roid@...lanox.com
Subject: Re: [PATCH net] net: sched: act_tunnel_key: fix NULL pointer
 dereference during init

On Mon, 2019-02-25 at 17:28 +0200, Vlad Buslov wrote:
> Metadata pointer is only initialized for action TCA_TUNNEL_KEY_ACT_SET, but
> it is unconditionally dereferenced in tunnel_key_init() error handler.
> Verify that metadata pointer is not NULL before dereferencing it in
> tunnel_key_init error handling code.
> 
> Fixes: ee28bb56ac5b ("net/sched: fix memory leak in act_tunnel_key_init()")
> Signed-off-by: Vlad Buslov <vladbu@...lanox.com>
> ---
>  net/sched/act_tunnel_key.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
> index 8b43fe0130f7..3f943de9a2c9 100644
> --- a/net/sched/act_tunnel_key.c
> +++ b/net/sched/act_tunnel_key.c
> @@ -377,7 +377,8 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
>  	return ret;
>  
>  release_tun_meta:
> -	dst_release(&metadata->dst);
> +	if (metadata)
> +		dst_release(&metadata->dst);
>  
>  err_out:
>  	if (exists)

Reviewed-by: Davide Caratti <dcaratti@...hat.com>