Date: Fri, 19 Sep 1997 10:15:05 +0200 (SAT) From: Graham Wheeler <gram@cdsec.com> To: tlambert@primenet.com (Terry Lambert) Cc: hackers@freebsd.org Subject: Re: Bug in malloc/free (was: Memory leak in getservbyXXX?) Message-ID: <199709190815.KAA01865@cdsec.com> In-Reply-To: <199709182114.OAA13613@usr03.primenet.com> from "Terry Lambert" at Sep 18, 97 09:14:40 pm
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>
> How about:
>
> heap_ptr p = malloc( 20);
> heap_ptr q, r;
> free(p);
> q = malloc(10)
> r = malloc( 10);
> free(p);
>
> ? 8-).
Well, in this case q is typically equal to p. So the call to free(p) is
not a heap error (even though it is logically an error).
Would one call this a `Godel error'? ;-)
If you add a line afterwards of the form `free(q);', then of course this
added line is detected:
Bad call to free from file gwtest.c, line 33
Possibly freed before at gwtest.c, line 32, size 10
--
Dr Graham Wheeler E-mail: gram@cdsec.com
Citadel Data Security Phone: +27(21)23-6065/6/7
Internet/Intranet Network Specialists Mobile: +27(83)-253-9864
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