Fix for CVE-2018-16858 and CVE-2019-9852

Hi,
for a presentation for university I need the specific lines of code that fixed the vulnerabilities CVE-2018.16858 and CVE-2019-9852. Unfortunately I can’t find them and I thought maybe someone on here could help me out.
Thanks

Have a look at:

I don’t really know how that helps me in my situation