Mozilla: Use-after-free in SMIL animation functions (MFSA 2017-11, MFSA 2017-12)

A use-after-free vulnerability in SMIL animation functions occurs when pointers to animation elements in an array are dropped from the animation controller while still in use. This results in a potentially exploitable crash. This vulnerability affects Thunderbird 52.1, Firefox ESR 45.9, Firefox E...