Date: Tue, 29 Dec 1998 05:36:01 -0800 (PST) From: schmr000@mail.uni-mainz.de To: freebsd-gnats-submit@FreeBSD.ORG Subject: bin/9233: gmp's mpq_add and mpq_sub are buggy Message-ID: <199812291336.FAA00418@hub.freebsd.org>
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>Number: 9233
>Category: bin
>Synopsis: gmp's mpq_add and mpq_sub are buggy
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Dec 29 05:40:00 PST 1998
>Last-Modified:
>Originator: Ralf Schmitt
>Organization:
>Release: 3.0
>Environment:
FreeBSD myname.my.domain 3.0-RELEASE FreeBSD 3.0-RELEASE #1: Tue Dec 22
>Description:
A bug in mpq_add and mpq_sub makes them work unreliably due to
references outside of allocated memory (quoted from the GNU MP web pages)
>How-To-Repeat:
Compile and run the following program:
#include <iostream.h>
#include <gmp.h>
void setRational(mpq_t &rat, const char *num, const char *den)
{
mpz_t tmp;
mpz_init(tmp);
mpz_set_str(tmp, num, 10);
mpq_set_num(rat, tmp);
mpz_set_str(tmp, den, 10);
mpq_set_den(rat, tmp);
mpz_clear(tmp);
}
void test()
{
mpq_t r1,r2, result;
mpq_init(r1);
mpq_init(r2);
mpq_init(result);
setRational(r1,"1999999999999999999","10000000000000000000000000000000000");
setRational(r2, "-1","100000000");
cout << "Calling mpq_sub" << endl;
mpq_sub(result, r1, r2);
}
int main()
{
test();
}
>Fix:
Apply the diffs from the GNU MP web pages:
http://www.matematik.su.se/~tege/gmp
>Audit-Trail:
>Unformatted:
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