Potential infinite loop in gdImageCreateFromGifCtx!

How it was found

Description

It is easy to trigger in web application if the web use GD as its image library. For example, It can be triggered if a website resize the user-uploaded GIF, and ALL PHP version are affected! 　

Original bug report

• https://bugs.php.net/bug.php?id=75571

Note

• CVE-2018-5711 assigned

　 Thanks :)

Impact

A malicious GIF can trigger an infinite loop and lead to exhausted the server resource!