[Bug-glpk] [Fwd: segfault reading a compressed mps file in 4.52]

[Andrew Makhorin]

-------- Forwarded Message --------
From: Carlo Baldassi <address@hidden>
To: address@hidden
Cc: Miles Lubin <address@hidden>
Subject: segfault reading a compressed mps file in 4.52
Date: Tue, 26 Nov 2013 19:08:35 +0100

Using GLPK 4.52, glp_read_mps fails with a segfault on this file:

https://github.com/mlubin/SimplexBenchmarks/raw/master/GenerateData/greenbea.gz


uncompressing it works fine. Also, GLPK 4.48 works fine on the
compressed file, so the bug was introduced between these versions.


I'm testing on 64bit Linux (Ubuntu 13.04). zlib version is 1.2.7.


Here is a sample C file which reproduces the problem:

#include <stdio.h>
#include <stdlib.h>
#include <glpk.h>

int main()
{
   glp_prob * lp;
   lp = glp_create_prob();
   glp_read_mps(lp, GLP_MPS_DECK, NULL, "greenbea.gz");
   glp_delete_prob(lp);
   return 0;
}



Here is the output:

$ glpktst
Reading problem data from `greenbea.gz'...
Segmentation fault (core dumped)


Best regards

Carlo Baldassi