linux-kernel - RE: [PATCH v6 3/5] KVM: selftests: Add atoi_paranoid() to catch errors missed by atoi()

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Message-ID: <DS0PR11MB63733C7CA0B1497215B40F8DDC309@DS0PR11MB6373.namprd11.prod.outlook.com>
Date:   Wed, 26 Oct 2022 02:16:14 +0000
From:   "Wang, Wei W" <wei.w.wang@...el.com>
To:     Vipin Sharma <vipinsh@...gle.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "dmatlack@...gle.com" <dmatlack@...gle.com>
CC:     "andrew.jones@...ux.dev" <andrew.jones@...ux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6 3/5] KVM: selftests: Add atoi_paranoid() to catch
 errors missed by atoi()

On Saturday, October 22, 2022 5:18 AM, Vipin Sharma wrote:
> +int atoi_paranoid(const char *num_str)
> +{
> +	char *end_ptr;
> +	long num;
> +
> +	errno = 0;
> +	num = strtol(num_str, &end_ptr, 10);

Why not use strtoull here?
Negative numbers will result in a huge "unsigned long long" number,
and this will be captured by your TEST_ASSERT(num >= INT_MIN) below.
Then we don't need patch 4, I think.


> +	TEST_ASSERT(!errno, "strtol(\"%s\") failed", num_str);
> +	TEST_ASSERT(num_str != end_ptr,
> +		    "strtol(\"%s\") didn't find a valid integer.\n", num_str);
> +	TEST_ASSERT(*end_ptr == '\0',
> +		    "strtol(\"%s\") failed to parse trailing characters \"%s\".\n",
> +		    num_str, end_ptr);
> +	TEST_ASSERT(num >= INT_MIN && num <= INT_MAX,
> +		    "%ld not in range of [%d, %d]", num, INT_MIN, INT_MAX);
> +
> +	return num;
> +}