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Mailing List Message of <popt-devel>

Memory leak with poptGetNextOpt

From: Karl Lindén <spray.sucks@gmail.com>
Date: Thu 02 May 2013 - 23:56:52 CEST
Message-ID: <CAD9Lw0bV62uNgrtEvhT3uMchQ2pkUJX0sBJnV4mG+i2-oJeJfw@mail.gmail.com>

I am memory checking a program using the popt library but it seems as
there is some kind of memory leak in poptGetNextOpt. I have written a
small test program to show the issue. The program will basically just
take an integer argument and print the integer to the prompt. Of
course, the program works as expected, but valgrind records a leak.

I am attaching the test program. The valgrind output I will post
further down this mail.

I'm using popt version 1.16.

The program was compiled with the following command:
$ gcc -lpopt popt_test.c -o popt_test

$ valgrind --leak-check=full ./popt_test -i 890
==1170== Memcheck, a memory error detector
==1170== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==1170== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==1170== Command: ./popt_test -i 890
integer = 890
==1170== HEAP SUMMARY:
==1170==     in use at exit: 4 bytes in 1 blocks
==1170==   total heap usage: 6 allocs, 5 frees, 882 bytes allocated
==1170== 4 bytes in 1 blocks are definitely lost in loss record 1 of 1
==1170==    at 0x4A099EB: malloc (in
==1170==    by 0x4C3372D: expandNextArg (popt.c:696)
==1170==    by 0x4C34FD4: poptGetNextOpt (popt.c:1498)
==1170==    by 0x400873: main (in /home/kalle/popt_test)
==1170== LEAK SUMMARY:
==1170==    definitely lost: 4 bytes in 1 blocks
==1170==    indirectly lost: 0 bytes in 0 blocks
==1170==      possibly lost: 0 bytes in 0 blocks
==1170==    still reachable: 0 bytes in 0 blocks
==1170==         suppressed: 0 bytes in 0 blocks
==1170== For counts of detected and suppressed errors, rerun with: -v
==1170== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)

Should I do something to free the memory or is it some kind of bug?

Thanks in advance,
Karl Lindén

Received on Fri May 3 07:10:36 2013
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