linux-kernel - Re: [PATCH] pktgen: use dynamic allocation for debug print buffer

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Message-ID: <CAP4sYWURRroc0H7vDcMdmi2cyuKxHfcj12X0zqWjw1vcoru06A@mail.gmail.com>
Date:   Wed, 14 Mar 2018 11:02:57 +0800
From:   Wang Jian <jianjian.wang1@...il.com>
To:     David Miller <davem@...emloft.net>
Cc:     arnd@...db.de, gustavo@...eddedor.com, dima@...sta.com,
        johannes.berg@...el.com, edumazet@...gle.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pktgen: use dynamic allocation for debug print buffer

>> +  kfree(buf);
free tb? buf is an array.

On Wed, Mar 14, 2018 at 8:25 AM, David Miller <davem@...emloft.net> wrote:
> From: Arnd Bergmann <arnd@...db.de>
> Date: Tue, 13 Mar 2018 21:58:39 +0100
>
>> After the removal of the VLA, we get a harmless warning about a large
>> stack frame:
>>
>> net/core/pktgen.c: In function 'pktgen_if_write':
>> net/core/pktgen.c:1710:1: error: the frame size of 1076 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
>>
>> The function was previously shown to be safe despite hitting
>> the 1024 bye warning level. To get rid of the annoyging warning,
>> while keeping it readable, this changes it to use strndup_user().
>>
>> Obviously this is not a fast path, so the kmalloc() overhead
>> can be disregarded.
>>
>> Fixes: 35951393bbff ("pktgen: Remove VLA usage")
>> Signed-off-by: Arnd Bergmann <arnd@...db.de>
>
> Applied, thanks.