linux-kernel - Re: [PATCH] genetlink: fix unsigned int comparison with less than zero

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Date:   Thu, 10 Nov 2016 09:11:29 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Johannes Berg <johannes.berg@...el.com>,
        pravin shelar <pshelar@....org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Florian Westphal <fw@...len.de>,
        Tycho Andersen <tycho.andersen@...onical.com>,
        Tom Herbert <tom@...bertland.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] genetlink: fix unsigned int comparison with less than zero

On Thu, Nov 10, 2016 at 7:57 AM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> family->id is unsigned, so the less than zero check for
> failure return from idr_alloc is never true and so the error exit
> is never handled.  Instead, assign err and check if this is less
> than zero since this is a signed integer.

Why family->id can't be just signed int? For me it should be.