Description of problem:
$ cat strduptest.c 
#include <string.h>

int main(void)
{
        strdup(NULL);
}

$ gcc -o strduptest strduptest.c
$ ./strduptest
Segmentation fault (core dumped)

And dmesg shows:
strduptest[2374]: segfault at 0 ip 0000003b97086711 sp 00007fff67a8cd98 error 4 in libc-2.17.so[3b97000000+1b6000]

Version-Release number of selected component (if applicable):
glibc-2.17-18.fc19

How reproducible:
always

Steps to Reproduce:
1. see description
2.
3.

Actual results:
segfault

Expected results:
strdup(3) should deal with NULL correctly

Additional info: