netdev - Re: [PATCH net-next v6 03/11] ipv4/route: Allow NULL flowinfo in rt_fill

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Date:   Thu, 20 Jun 2019 07:15:55 -0600
From:   David Ahern <dsahern@...il.com>
To:     Stefano Brivio <sbrivio@...hat.com>,
        David Miller <davem@...emloft.net>
Cc:     Jianlin Shi <jishi@...hat.com>, Wei Wang <weiwan@...gle.com>,
        Martin KaFai Lau <kafai@...com>,
        Eric Dumazet <edumazet@...gle.com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        netdev@...r.kernel.org
Subject: Re: [PATCH net-next v6 03/11] ipv4/route: Allow NULL flowinfo in
 rt_fill_info()

On 6/19/19 5:59 PM, Stefano Brivio wrote:
> In the next patch, we're going to use rt_fill_info() to dump exception
> routes upon RTM_GETROUTE with NLM_F_ROOT, meaning userspace is requesting
> a dump and not a specific route selection, which in turn implies the input
> interface is not relevant. Update rt_fill_info() to handle a NULL
> flowinfo.
> 
> Suggested-by: David Ahern <dsahern@...il.com>
> Signed-off-by: Stefano Brivio <sbrivio@...hat.com>
> ---
> v6: New patch
> 
>  net/ipv4/route.c | 57 ++++++++++++++++++++++++++----------------------
>  1 file changed, 31 insertions(+), 26 deletions(-)
> 
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index 66cbe8a7a168..052a80373b1d 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -2699,7 +2699,8 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src,
>  	r->rtm_family	 = AF_INET;
>  	r->rtm_dst_len	= 32;
>  	r->rtm_src_len	= 0;
> -	r->rtm_tos	= fl4->flowi4_tos;
> +	if (fl4)
> +		r->rtm_tos	= fl4->flowi4_tos;

tracing back to the alloc_skb it does not appear to be initialized to 0,
so this should be:
	r->rtm_tos	= fl4 ? fl4->flowi4_tos : 0;


other than that it looks fine to me.

Reviewed-by: David Ahern <dsahern@...il.com>