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avcodec/sonic: Check for overread

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Fixes: Timeout (too long -> 1.3 sec)
Fixes: 24358/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5107284099989504

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 eeabdef1bf96cdecf80aeb8d0478d008457b048c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-19 11:29:01 +02:00
parent 2659b0f180
commit d09bc9fe7f
1 changed files with 3 additions and 0 deletions
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3
libavcodec/sonic.c
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@ -1031,6 +1031,9 @@ static int sonic_decode_frame(AVCodecContext *avctx,
{ {
int x = ch; int x = ch;
if (c.overread > MAX_OVERREAD)
return AVERROR_INVALIDDATA;
predictor_init_state(s->predictor_k, s->predictor_state[ch], s->num_taps); predictor_init_state(s->predictor_k, s->predictor_state[ch], s->num_taps);
intlist_read(&c, state, s->coded_samples[ch], s->block_align, 1); intlist_read(&c, state, s->coded_samples[ch], s->block_align, 1);