avcodec/shorten: Sanity check nmeans
authorMichael Niedermayer <michael@niedermayer.cc>
Tue, 5 Jun 2018 11:03:48 +0000 (13:03 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Thu, 7 Jun 2018 17:52:57 +0000 (19:52 +0200)
commitd91a0b503d7a886587281bc1ee42476aa5e89f85
tree6ce3a67bb4b04fdeb6301a2a654f28bec39b184d
parent3769aafb7c9a1fdcd1c9099a8ed7ba1d876c0693
avcodec/shorten: Sanity check nmeans

Fixes: OOM
Fixes: 8195/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SHORTEN_fuzzer-5179785826271232

The reference software appears to use longs for 32bits and it uses int for nmeans
hinting that the intended maximum size was not 32bit.

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/shorten.c