linux-kernel - Re: [3/3] Coccinelle: pci_free_consistent: Extend when constraints for two SmPL ellipses

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Date:   Wed, 15 May 2019 14:48:48 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Wen Yang <wen.yang99@....com.cn>,
        Julia Lawall <julia.lawall@...6.fr>
Cc:     Gilles Muller <Gilles.Muller@...6.fr>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        Yi Wang <wang.yi59@....com.cn>,
        Cheng Shengyu <cheng.shengyu@....com.cn>,
        Ma Jiang <ma.jiang@....com.cn>,
        Coccinelle <cocci@...teme.lip6.fr>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [3/3] Coccinelle: pci_free_consistent: Extend when constraints
 for two SmPL ellipses

> 2,  If you really plan to add the two restrictions above,
> you may need to consider this further than simply adding a "when != id = (T2)(e)" statement.
> I constructed the flollowing code snippet as a test case:
…
> Using the original SmPL, we can find a bug.
> But with your modified SmPL, we can't find the bug.

The difference is the possible exclusion of a reassignment to a local variable
in which a pointer was stored for a resource allocation.

Would you like to adjust corresponding case distinctions any further?

How many script variants will become relevant here?

Regards,
Markus