netdev - Re: UBSAN reports issue in ip_idents

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Message-ID: <1474381450.23058.13.camel@edumazet-glaptop3.roam.corp.google.com>
Date:   Tue, 20 Sep 2016 07:24:10 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jiri Pirko <jiri@...nulli.us>
Cc:     netdev@...r.kernel.org
Subject: Re: UBSAN reports issue in ip_idents_reserve

On Tue, 2016-09-20 at 07:18 -0700, Eric Dumazet wrote:

> +	 */
> +	if (unlikely(atomic_cmpxchg(p_id, old, new) != old))
> +		new = prandom_u32();
> +	return new;

Looks like we should return new - segs;