Bug#692433: getaddrinfo: Syscall param socketcall.connect(serv_addr.sin6_addr) points to uninitialised byte(s)

[Tim Ruehsen <tim.ruehsen@gmx.de>]

Package: libc6
Version: 2.13-36
Severity: normal

Dear Maintainer,

when calling getaddrinfo(), valgrind detects:
==7051== Syscall param socketcall.connect(serv_addr.sin6_addr) points to uninitialised byte(s)
==7051==    at 0x362E6DB780: __connect_nocancel (syscall-template.S:82)
==7051==    by 0x362E6B9307: getaddrinfo (getaddrinfo.c:2279)
==7051==    by 0x4006A3: main (x.c:17)
==7051==  Address 0x7feffff10 is on thread 1's stack
==7051==  Uninitialised value was created by a stack allocation
==7051==    at 0x362E6B8FD0: getaddrinfo (getaddrinfo.c:2092)

Here is the short C source to reproduce the problem (gcc -g x.c -o x):
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
                                                                                                                       
void main(void)                                                                                                        
{                                                                                                                      
        struct addrinfo *addrinfo = NULL;
        struct addrinfo hints;

        memset(&hints,0,sizeof(hints));
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        hints.ai_flags = AI_NUMERICSERV;

        if (getaddrinfo("www.example.com", "80", &hints, &addrinfo) == 0)
                freeaddrinfo(addrinfo);
}

This problem is pretty new, maybe introduced by fixing bug #690021.

Regards, Tim

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.ISO-8859-15, LC_CTYPE=en_US.ISO-8859-15 (charmap=ISO-8859-15)
Shell: /bin/sh linked to /bin/dash

Versions of packages libc6:amd64 depends on:
ii  libc-bin  2.13-36
ii  libgcc1   1:4.7.2-4

libc6:amd64 recommends no packages.

Versions of packages libc6:amd64 suggests:
ii  debconf [debconf-2.0]  1.5.46
ii  glibc-doc              2.13-36
ii  locales                2.13-36
ii  locales-all [locales]  2.13-36

-- debconf information excluded