linux-kernel - Re: [PATCH] iavf: Fix null pointer dereference in iavf_print_link

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Message-ID: <ae686e04-b65c-4a4d-b208-076136bae070@kylinos.cn>
Date:   Thu, 14 Dec 2023 14:46:06 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, edumazet@...gle.com, pabeni@...hat.com,
        jacob.e.keller@...el.com, przemyslaw.kitszel@...el.com,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kunwu Chan <kunwu.chan@...mail.com>
Subject: Re: [PATCH] iavf: Fix null pointer dereference in
 iavf_print_link_message

Thanks for your reply.
Sure, the only thing 'iavf_print_link_message' do is to print a msg by 
netdev_info.

The 'iavf_virtchnl_completion' assume that no errors will be returned.
Whether we could just execute 'netdev_info(netdev, "NIC Link is Up Speed 
is %s Full Duplex\n", speed? speed :"");' when 'speed' is null.

Before commit '1978d3ead82c8', the buffer size is '#define 
IAVF_MAX_SPEED_STRLEN  13', whether we could use a bigger buffer
size to avoid a null pointer.

Such as '#define IAVF_MAX_SPEED_STRLEN 48'.

On 2023/12/13 05:28, Jakub Kicinski wrote:
> On Mon, 11 Dec 2023 10:59:27 +0800 Kunwu Chan wrote:
>> kasprintf() returns a pointer to dynamically allocated memory
>> which can be NULL upon failure.
>>
>> Fixes: 1978d3ead82c ("intel: fix string truncation warnings")
> 
> No need for the allocation here, print to a buffer on the stack.