Date: Thu, 22 Feb 2001 16:16:54 +0300 (MSK) From: Dmitry Dicky <diwil@eis.ru> To: freebsd-hackers@FreeBSD.ORG Subject: Re: warning in free(): Message-ID: <XFMail.010222161654.diwil@eis.ru> In-Reply-To: <20010222051302.E29126@fw.wintelcom.net>
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Also, if you do something like:
void *ptr = malloc(size);
...
ptr++;
free() will complain about it.
Make sure you are not modifying ptr after it has been malloc()ed.
On 22-Feb-01 Alfred Perlstein wrote:
> * Madhavi Suram <madhavis@sasken.com> [010222 05:09] wrote:
>>
>> Hi
>>
>> I am running a C program in user space on FreeBSD 3.3 release. I got a
>> warning like this:
>>
>> testing in free(): warning: modified (chunk-) pointer.
>>
>> testing is the name of the executable I am running.
>>
>> Could anyone tell me what this warning means? What may be the effect
>> of
>> this code when I shift it to kernel with due modifications?
>
> It means you've most likely corrupted your malloc pool, meaning you've
> written past/before the edge of an allocation you've done.
>
> To fix it start being mor careful with pointers and checking array
> bounds.
>
>
> --
> -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org]
>
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