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>
Mon, 9 Jul 2018 23:52:56 +0000 (01:52 +0200)
commitf41da2bd5ff7d9d6b1141284dbd526d8b232e29b
treefc58ca735d939f8b7910f9918ab85e3e817e0253
parentce4cb475a3714def0ad80a5ad74f2c9c90683f88
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