FFmpeg Multiple Vulnerabilities

Multiple vulnerabilities have been identified in FFmpeg, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise an application using the library.

1. Some errors within the "ff_vc1_decode_init_alloc_tables()" function (libavcodec/vc1dec.c) can be exploited to exhaust available memory.
2. An integer overflow error within the "decode_frame()" function (libavcodec/wnv1.c) can be exploited to cause a heap-based buffer overflow.
3. A boundary error within the "ea_read_packet()" function (libavformat/electronicarts.c) can be exploited to trigger an out-of-bounds memory read access and subsequently cause a crash.