[Bug libc/11571] New: getlogin_r (NULL, 0) segfaults

["rjones at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

#include <unistd.h>

main ()
{
  getlogin_r (NULL, 0);
}
----
$ gcc -g test.c -o test
$ ./test 
Segmentation fault (core dumped)
----

This seems to be a regression in glibc 2.12, since glibc 2.11.90
did not segfault under these conditions.

The stack trace is:

Program received signal SIGSEGV, Segmentation fault.
__strncpy_sse2 (s1=0x0, s2=0x7fffffffdee1 "jones", n=18446744073709551615)
    at ./strncpy.c:43
43		  *++s1 = c;
(gdb) bt
#0  __strncpy_sse2 (s1=0x0, s2=0x7fffffffdee1 "jones", n=18446744073709551615)
    at ./strncpy.c:43
#1  0x00007ffff7b071d2 in __getlogin_r_loginuid (name=0x0, namesize=0)
    at ../sysdeps/unix/sysv/linux/getlogin_r.c:84
#2  0x00007ffff7b07299 in getlogin_r (name=0x0, namesize=0)
    at ../sysdeps/unix/sysv/linux/getlogin_r.c:103
#3  0x00000000004004d7 in main () at test.c:5

-- 
           Summary: getlogin_r (NULL, 0) segfaults
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: rjones at redhat dot com
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=11571

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