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 compromise an application using the library.

1. An error within the "ff_init_buffer_info()" function (libavcodec/utils.c) can be exploited to cause an out-of-bounds memory access.
2. A boundary error within the "read_var_block_data()" function (libavcodec/alsdec.c) can be exploited to cause an out-of-bounds write memory access.
3. Some errors within the HEVC video decoder can be exploited to cause out-of-bounds memory accesses.