netdev - Re: net: integer overflow in ip_idents

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Message-ID: <1418766460.9773.48.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 16 Dec 2014 13:47:40 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Dave Jones <davej@...hat.com>
Subject: Re: net: integer overflow in ip_idents_reserve

On Tue, 2014-12-16 at 16:19 -0500, Sasha Levin wrote:
> Hi Eric,
> 
> While fuzzing with trinity on a -next kernel with the undefined behaviour
> sanitizer path, I've observed the following warning in code which was
> introduced in 04ca6973f7 ("ip: make IP identifiers less predictable"):

This is a false positive.

We don't really care of the value if (now - old) is too big :

No packet was sent recently, so IP ID being X or Y is not a concern.



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