How to find the original code that causes a CVE?

[Peng Yu]

Hi,

https://www.cvedetails.com/cve/CVE-2017-16997/

I see this CVE for glibc. But it is not clear how to look up which
line of the source code causes this vulnerability. Could anybody show
me how to look this up?

-- 
Regards,
Peng