Package: lp-solve
Version: 5.5.0.10-10
Severity: grave
Justification: renders package unusable
The lp-solve documentation states: "For add_columnex, column and rowno
can both be NULL. In that case an empty column is added." This means the
following call should be valid:
add_columnex(lp, 0, NULL, NULL);
lp-solve accepts that call and seemingly does add a column to the model.
However, when later adding constraints it crashes with a segfault. As
this is the only way to add columns to a model after building it, it is
a very serious bug. The behaviour can be reproduced with the following
example code. Remove the add_columnex line and it works fine. Keep it
and watch the crash on add_constraint.
#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"
int main(void)
{
lprec *lp;
/* Create a new LP model */
lp = make_lp(0, 3);
int i = 0;
for (i = 0; i < 10000; ++i) {
add_columnex(lp, 0, NULL, NULL);
}
REAL con[1+3]; /* must be 1 more than number of rows ! */
con[0] = 1.0; /* the objective value */
con[1] = 2.0;
con[2] = 0.0;
con[3] = 3.0;
add_constraint(lp, con, LE, 5);
write_LP(lp, stdout);
delete_lp(lp);
return(0);
}
-- System Information:
Debian Release: 5.0
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.26-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages lp-solve depends on:
ii libc6 2.7-18 GNU C Library: Shared libraries
ii libsuitesparse-3.1.0 3.1.0-3 collection of libraries for comput
lp-solve recommends no packages.
lp-solve suggests no packages.
-- no debconf information
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