Bug 116526

Description of problem:

According to valgrind, getaddrinfo() is leaking memory. 
freeaddrinfo() does not release everything that was allocate by
getaddrinfo().

Version-Release number of selected component (if applicable):

glibc-2.3.2-101.4

How reproducible:

Always.

Steps to Reproduce:
1. Compile the following program:  cc -g -o leakcheck leakcheck.c

#include <netdb.h>
 
int main()
{
        struct addrinfo hints, *res;
        int i;
        int errcode;
 
        for (i=0; i<100; i++)
        {
                memset(&hints, 0, sizeof(hints));
                hints.ai_family=PF_UNSPEC;
                hints.ai_socktype=SOCK_STREAM;
 
                errcode=getaddrinfo("www.cnn.com", "http", &hints, &res);
 
                if (errcode)
                {
                        printf("%s\n", gai_strerror(errcode));
                        exit(1);
                }
 
                freeaddrinfo(res);
        }
}


2. valgrind --num-callers=12 --leak-check=yes ./leakcheck

Actual results:

==12713== Memcheck, a.k.a. Valgrind, a memory error detector for
x86-linux.
==12713== Copyright (C) 2002-2003, and GNU GPL'd, by Julian Seward.
==12713== Using valgrind-2.0.0, a program supervision framework for
x86-linux.
==12713== Copyright (C) 2000-2003, and GNU GPL'd, by Julian Seward.
==12713== Estimated CPU clock rate is 1137 MHz
==12713== For more details, rerun with: -v
==12713==
==12713== discard syms in /lib/libnss_files-2.3.2.so due to munmap()
==12713== discard syms in /lib/libnss_dns-2.3.2.so due to munmap()
==12713== discard syms in /lib/libresolv-2.3.2.so due to munmap()
==12713==
==12713== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 6 from 1)
==12713== malloc/free: in use at exit: 2772 bytes in 99 blocks.
==12713== malloc/free: 1360 allocs, 1261 frees, 190793 bytes allocated.
==12713== For counts of detected errors, rerun with: -v
==12713== searching for pointers to 99 not-freed blocks.
==12713== checked 4590680 bytes.
==12713==
==12713== 2772 bytes in 99 blocks are definitely lost in loss record 1
of 1
==12713==    at 0x9ED68E: malloc (vg_replace_malloc.c:153)
==12713==    by 0xD5BE9B: ???
==12713==    by 0xD5AC12: ???
==12713==    by 0xD5B309: ???
==12713==    by 0xD5AF0F: ???
==12713==    by 0x64805D: ???
==12713==    by 0xF86D25: gaih_inet (in /lib/libc-2.3.2.so)
==12713==    by 0xF87923: __GI_getaddrinfo (in /lib/libc-2.3.2.so)
==12713==    by 0x80484D1: main (leakcheck.c:15)
==12713==    by 0xED5BBE: __libc_start_main (in /lib/libc-2.3.2.so)
==12713==    by 0x80483E8: (within /var/tmp/leakcheck)
==12713==
==12713== LEAK SUMMARY:
==12713==    definitely lost: 2772 bytes in 99 blocks.
==12713==    possibly lost:   0 bytes in 0 blocks.
==12713==    still reachable: 0 bytes in 0 blocks.
==12713==         suppressed: 0 bytes in 0 blocks.
==12713== Reachable blocks (those to which a pointer was found) are
not shown.
==12713== To see them, rerun with: --show-reachable=yes