linux-kernel - Re: [PATCH] can: fix warning in bcm_connect/proc

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Message-ID: <CAM_iQpVmhH_9vQcTw+wP1qmPLOijZZrMZrq=_e4i5fUXYDON0Q@mail.gmail.com>
Date:   Mon, 24 Oct 2016 13:17:19 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Oliver Hartkopp <socketcan@...tkopp.net>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>,
        David Miller <davem@...emloft.net>, linux-can@...r.kernel.org,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH] can: fix warning in bcm_connect/proc_register

On Mon, Oct 24, 2016 at 1:10 PM, Cong Wang <xiyou.wangcong@...il.com> wrote:
> On Mon, Oct 24, 2016 at 12:11 PM, Oliver Hartkopp
> <socketcan@...tkopp.net> wrote:
>>         if (proc_dir) {
>>                 /* unique socket address as filename */
>>                 sprintf(bo->procname, "%lu", sock_i_ino(sk));
>>                 bo->bcm_proc_read = proc_create_data(bo->procname, 0644,
>>                                                      proc_dir,
>>                                                      &bcm_proc_fops, sk);
>> +               if (!bo->bcm_proc_read) {
>> +                       ret = -ENOMEM;
>> +                       goto fail;
>> +               }
>
> Well, I meant we need to call proc_create_data() once per socket,
> so we need a check before proc_create_data() too.

Hmm, bo->bound should guarantee it, so never mind, your patch
looks fine.