linux-kernel - Re: [v3] Coccinelle: semantic code search for “use after …”

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Date:   Thu, 18 Jul 2019 14:54:32 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Wen Yang <wen.yang99@....com.cn>, cocci@...teme.lip6.fr,
        kernel-janitors@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Xue Zhihong <xue.zhihong@....com.cn>,
        Yi Wang <wang.yi59@....com.cn>,
        Cheng Shengyu <cheng.shengyu@....com.cn>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Michal Marek <michal.lkml@...kovi.net>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Wen Yang <yellowriver2010@...mail.com>
Subject: Re: [v3] Coccinelle: semantic code search for “use after …”

> Finally, this patch finds use-after-free issues for a node.
> (implemented by the r_use_after_put rule)

I suggest to take another look also at information from a clarification attempt
on a topic like “Checking statement order for patch generation with SmPL support”.
https://systeme.lip6.fr/pipermail/cocci/2017-September/004483.html
https://lore.kernel.org/cocci/alpine.DEB.2.20.1709071519240.3168@hadrien/

Under which circumstances will it become safer to develop SmPL script variants
for such source code search patterns?

Regards,
Markus