CVE-2020-26682 – In libass 0.14.0, the `ass_outline_construct`’s call to `outline_stroke`

In libass 0.14.0, the `ass_outline_construct`’s call to `outline_stroke` causes a signed integer overflow.

Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26682

Reference (s):

• GENTOO:GLSA-202012-12
• URL: https://security.gentoo.org/glsa/202012-12
• https://github.com/libass/libass/issues/431
• https://github.com/libass/libass/pull/432
• MLIST:[oss-security] 20201119 Re: libass ass_outline.c signed integer overflow