linux-kernel - Re: [PATCH 1/3] kstrtox: introduce a safer version of memparse()

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Message-ID: <20231228002603.059bfb1c@echidna>
Date: Thu, 28 Dec 2023 00:26:03 +1100
From: David Disseldorp <ddiss@...e.de>
To: Qu Wenruo <wqu@...e.com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 akpm@...ux-foundation.org, christophe.jaillet@...adoo.fr,
 andriy.shevchenko@...ux.intel.com, David.Laight@...LAB.COM
Subject: Re: [PATCH 1/3] kstrtox: introduce a safer version of memparse()

On Sat, 23 Dec 2023 20:28:05 +1030, Qu Wenruo wrote:

> +	s = _parse_integer_fixup_radix(s, &base);
> +	rv = _parse_integer(s, base, &value);
> +	if (rv & KSTRTOX_OVERFLOW)
> +		return -ERANGE;
> +	if (rv == 0)
> +		return -EINVAL;

I was playing around with your unit tests and noticed that "0xG" didn't
reach the expected rv == 0 -> -EINVAL above. It seems that
_parse_integer_fixup_radix() should handle 0x<non hex> differently, or
at least step past any autodetected '0' octal prefix.

Cheers, David