linux-kernel - tcp: Checking a kmemdup() call in tcp_time

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Message-ID: <a219235e-bad5-8a9d-0f3e-c05d5cb11df1@web.de>
Date:   Sat, 12 Oct 2019 16:51:48 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     netdev@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Hideaki Yoshifuji <yoshfuji@...ux-ipv6.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org, Aditya Pakki <pakki001@....edu>,
        Kangjie Lu <kjlu@....edu>, Navid Emamdoost <emamd001@....edu>,
        Stephen McCamant <smccaman@....edu>
Subject: tcp: Checking a kmemdup() call in tcp_time_wait()

Hello,

I tried another script for the semantic patch language out.
This source code analysis approach points out that the implementation
of the function “tcp_time_wait” contains also a call of the function “kmemdup”.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/net/ipv4/tcp_minisocks.c?id=1c0cc5f1ae5ee5a6913704c0d75a6e99604ee30a#n306
https://elixir.bootlin.com/linux/v5.4-rc2/source/net/ipv4/tcp_minisocks.c#L306

* Do you find the usage of the macro call “BUG_ON” still appropriate at this place?
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/checkpatch.pl?id=1c0cc5f1ae5ee5a6913704c0d75a6e99604ee30a#n4080

* Is there a need to adjust the error handling here?

Regards,
Markus