From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: 4.4-rc2 xfrm_lookup kasan trace
Date: Thu, 03 Dec 2015 11:59:18 -0500 (EST)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 30 Nov 2015 17:22:11 -0800

> @@ -2198,6 +2198,7 @@ struct dst_entry *xfrm_lookup(struct net *net, struct dst_entry *dst_orig,
>  	xdst = NULL;
>  	route = NULL;
>  
> +	sk = sk_to_full_sk((struct sock *)sk);

The war against const...

I know this is the only instance where const is input, but you may want to
consider adding the const verion of the helper anyways to avoid ugly casts
like this.