netdev - Re: [PATCH net-next 1/1] netfilter: flowtable: Make sure dst

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Date:   Sun, 11 Apr 2021 12:58:26 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Roi Dayan <roid@...dia.com>
Cc:     netdev@...r.kernel.org, Oz Shlomo <ozsh@...dia.com>,
        Paul Blakey <paulb@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>
Subject: Re: [PATCH net-next 1/1] netfilter: flowtable: Make sure dst_cache
 is valid before using it

Hi Roi,

On Sun, Apr 11, 2021 at 11:13:34AM +0300, Roi Dayan wrote:
> It could be dst_cache was not set so check it's not null before using
> it.

Could you give a try to this fix?

net/sched/act_ct.c leaves the xmit_type as FLOW_OFFLOAD_XMIT_UNSPEC
since it does not cache a route.

Thanks.

> Fixes: 8b9229d15877 ("netfilter: flowtable: dst_check() from garbage collector path")
> Signed-off-by: Roi Dayan <roid@...dia.com>
> ---
>  net/netfilter/nf_flow_table_core.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/net/netfilter/nf_flow_table_core.c b/net/netfilter/nf_flow_table_core.c
> index 76573bae6664..e426077aaed1 100644
> --- a/net/netfilter/nf_flow_table_core.c
> +++ b/net/netfilter/nf_flow_table_core.c
> @@ -410,6 +410,8 @@ static bool flow_offload_stale_dst(struct flow_offload_tuple *tuple)
>  	if (tuple->xmit_type == FLOW_OFFLOAD_XMIT_NEIGH ||
>  	    tuple->xmit_type == FLOW_OFFLOAD_XMIT_XFRM) {
>  		dst = tuple->dst_cache;
> +		if (!dst)
> +			return false;
>  		if (!dst_check(dst, tuple->dst_cookie))
>  			return true;
>  	}
> -- 
> 2.26.2
> 

View attachment "fix.patch" of type "text/x-diff" (1014 bytes)