linux-kernel - Re: [PATCH] coccinelle: Check for missing NULL terminators in of_device

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Message-ID: <alpine.DEB.2.02.1405240956220.2012@localhost6.localdomain6>
Date:	Sat, 24 May 2014 09:57:00 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Stephen Boyd <sboyd@...eaurora.org>
cc:	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org,
	Mitchel Humpherys <mitchelh@...eaurora.org>,
	Julia Lawall <Julia.Lawall@...6.fr>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] coccinelle: Check for missing NULL terminators in
 of_device_id tables

On Fri, 23 May 2014, Stephen Boyd wrote:

> Failure to terminate an of_device_id table can lead to confusing
> failures depending on where the compiler places the array. Add a
> check to make sure these tables are terminated. Thanks to Mitchel
> Humpherys for coming up with the initial pattern.
> 
> Cc: Mitchel Humpherys <mitchelh@...eaurora.org>
> Cc: Julia Lawall <Julia.Lawall@...6.fr>
> Cc: Gilles Muller <Gilles.Muller@...6.fr>
> Cc: Nicolas Palix <nicolas.palix@...g.fr>
> Cc: Grant Likely <grant.likely@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---
>  scripts/coccinelle/misc/of_table.cocci | 81 ++++++++++++++++++++++++++++++++++
>  1 file changed, 81 insertions(+)
>  create mode 100644 scripts/coccinelle/misc/of_table.cocci
> 
> diff --git a/scripts/coccinelle/misc/of_table.cocci b/scripts/coccinelle/misc/of_table.cocci
> new file mode 100644
> index 000000000000..da8bfa69fa3e
> --- /dev/null
> +++ b/scripts/coccinelle/misc/of_table.cocci
> @@ -0,0 +1,81 @@
> +/// Make sure of_device_id tables are NULL terminated
> +//
> +// Keywords: of_table
> +// Confidence: Medium
> +// Options: --include-headers
> +
> +virtual patch
> +virtual context
> +virtual org
> +virtual report
> +
> +@..._of_table exists@
> +identifier var, arr;
> +expression E;
> +@@
> +... struct of_device_id arr[] = {
> +	...,
> +	{
> +	...,
> +	.var = E,
> +	...
> +	}
> +};

You shouldn't need any of the ...s in these rules.

julia

> +@...ends on bad_of_table && context@
> +identifier var, arr;
> +expression E;
> +@@
> + ... struct of_device_id arr[] = {
> +	...,
> +	{
> +	...,
> +*	.var = E,
> +	...
> +	}
> +};
> +
> +@...ends on bad_of_table && patch@
> +identifier var, arr;
> +expression E;
> +@@
> +... struct of_device_id arr[] = {
> +	...,
> +	{
> +	...,
> +	.var = E,
> +	...
> +-	}
> ++	},
> ++	{ }
> +};
> +
> +@r depends on bad_of_table exists@
> +position p1;
> +identifier var, arr;
> +expression E;
> +@@
> +... struct of_device_id arr[] = {
> +	...,
> +	{
> +	...,
> +	.var = E,
> +	...
> +	}
> +	@p1
> +};
> +
> +@...ipt:python depends on org@
> +p1 << r.p1;
> +arr << r.arr;
> +@@
> +
> +cocci.print_main(arr,p1)
> +
> +@...ipt:python depends on report@
> +p1 << r.p1;
> +arr << r.arr;
> +@@
> +
> +msg = "%s is not NULL terminated at line %s" % (arr, p1[0].line)
> +coccilib.report.print_report(p1[0],msg)
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
> 
> 
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