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>
Fri, 15 Jun 2018 20:31:13 +0000 (22:31 +0200)
commit3aa3b05d64040e4be8e840a969add39ffb72c54a
treed270cd759e0e3c961ae12281d18cececec720e60
parent7a5ddf731b5cc68bb199ccc7c826de04f7f83bf9
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>
(cherry picked from commit d91a0b503d7a886587281bc1ee42476aa5e89f85)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/shorten.c