CVE-2017-14171

In libavformat/nsvdec.c in FFmpeg 2.4 and 3.3.3, a DoS in
nsv_parse_NSVf_header() due to lack of an EOF (End of File) check might
cause huge CPU consumption. When a crafted NSV file, which claims a large
“table_entries_used” field in the header but does not contain sufficient
backing data, is provided, the loop over ‘table_entries_used’ would consume
huge CPU resources, since there is no EOF check inside the loop.