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

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Message-ID: <dda53231-656f-463b-21a6-7477a61f055a@embeddedor.com>
Date:   Wed, 14 Mar 2018 03:16:59 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Wang Jian <jianjian.wang1@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     arnd@...db.de, 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

Arnd:

Thanks for the fix.

On 03/13/2018 10:02 PM, Wang Jian wrote:
>>> +  kfree(buf);
> free tb? buf is an array.
> 

Wang:

Thanks for the report. I already sent a patch to fix this: 
https://patchwork.kernel.org/patch/10281587/

--
Gustavo

> 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.