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avcodec/cinepak: Check available input against encoded buffer size 

Fixes: Timeout (12sec -> 2sec)
Fixes: 14606/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_CINEPAK_fuzzer-5738687561728000

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-05-12 22:06:30 +02:00
parent 8b2140de63
commit 87a54e150e
1 changed files with 3 additions and 0 deletions
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3
libavcodec/cinepak.c
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@ -323,6 +323,9 @@ static int cinepak_predecode_check (CinepakContext *s)
num_strips = AV_RB16 (&s->data[8]);
encoded_buf_size = AV_RB24(&s->data[1]);
if (s->size < encoded_buf_size * (int64_t)(100 - s->avctx->discard_damaged_percentage) / 100)
return AVERROR_INVALIDDATA;
/* if this is the first frame, check for deviant Sega FILM data */
if (s->sega_film_skip_bytes == -1) {
if (!encoded_buf_size) {