If my understanding is correct, some patches in libsdl2 (2.0.2+dfsg1-6+deb8u1) as applied in Jessie cause issues because they were intended for libsdl1.2, not libsdl2.
The patch for CVE-2019-7637 causes regressions (more info here
), the commit here
fixes the CVE.
The patch for CVEs CVE-2019-7635, CVE-2019-7638 and CVE-2019-7636 has unreachable code. The commit here
fixes CVE-2019-7635 and the commit here
fixes CVEs CVE-2019-7638 and CVE-2019-7636.