decoder/ih264d_api.c in mediaserver in Android 6.x before 2016-09-01 mishandles the case of decoding zero MBs, which allows remote attackers to cause a denial of service (device hang or reboot) via a crafted media file, aka internal bug 29493002.
https://android.googlesource.com/platform/external/libavc/+/7109ce3f8f90a28ca9f0ee6e14f6ac5e414c62cf
http://www.securitytracker.com/id/1036763