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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

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.