linux-kernel - Re: [PATCH v4 2/2] bsearch: prevent overflow when computing middle comparison element

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Date:	Wed, 11 Nov 2009 13:28:25 -0200
From:	Thiago Farina <tfransosi@...il.com>
To:	André Goddard Rosa <andre.goddard@...il.com>
Cc:	tabbott@...lice.com, alan-jenkins@...fmail.co.uk,
	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] bsearch: prevent overflow when computing middle 
	comparison element

On Wed, Nov 11, 2009 at 1:09 PM, Thiago Farina <tfransosi@...il.com> wrote:
> On Tue, Nov 10, 2009 at 1:00 PM, André Goddard Rosa
> <andre.goddard@...il.com> wrote:
>>  void *bsearch(const void *key, const void *base, size_t num, size_t size,
>>              int (*cmp)(const void *key, const void *elt))
>>  {
>> -       int start = 0, end = num, mid, result;
>> +       size_t start = 0, end = num;
>> +       int result;
>>
>>        while (start < end) {
>> -               mid = (start + end) / 2;
>> +               size_t mid = start + (end - start) / 2;
> I think it is more readable if you could keep the mid variable outside
> of the while loop.
>
I mean: size_t start = 0, end = num, mid;
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