linux-hardening - Re: [PATCH v3 1/2] lib: introduce simple error-checking wrapper for memparse()

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Message-ID: <aWAPOyJwhpfKpqPy@smile.fi.intel.com>
Date: Thu, 8 Jan 2026 22:10:35 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Dmitry Antipov <dmantipov@...dex.ru>
Cc: Carlos Maiolino <cem@...nel.org>, Christoph Hellwig <hch@...radead.org>,
	Kees Cook <kees@...nel.org>, Andy Shevchenko <andy@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-xfs@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 1/2] lib: introduce simple error-checking wrapper for
 memparse()

On Thu, Jan 08, 2026 at 07:52:15PM +0300, Dmitry Antipov wrote:
> Introduce 'memvalue()' which uses 'memparse()' to parse a string
> with optional memory suffix into a non-negative number. If parsing
> has succeeded, returns 0 and stores the result at the location
> specified by the second argument. Otherwise returns -EINVAL and
> leaves the location untouched.

...

> +int __must_check memvalue(const char *ptr, unsigned long long *valptr)
> +{
> +	unsigned long long ret;
> +	char *end;
> +
> +	if (*ptr == '-')
> +		return -EINVAL;

Hmm... Why not -ERANGE (IIRC this what kstrto*() returns when it doesn't match
the given range).

> +	ret = memparse(ptr, &end);
> +	if (*end)
> +		return -EINVAL;
> +	*valptr = ret;
> +	return 0;
> +}

-- 
With Best Regards,
Andy Shevchenko