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avcodec/alsdec: Check that input space for header exists in read_diff_float_data()

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Fixes: Timeout (21sec -> 8sec)
Fixes: 17832/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5737092172218368

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 09581f7923ed9af7719762868e8f1ff626ea8374)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-04 19:35:15 +02:00
parent 15320f8107
commit fcd38fcb1e
1 changed files with 3 additions and 0 deletions

3
libavcodec/alsdec.c

@ -1475,6 +1475,9 @@ static int read_diff_float_data(ALSDecContext *ctx, unsigned int ra_frame) {
ff_mlz_flush_dict(ctx->mlz);
}
if (avctx->channels * 8 > get_bits_left(gb))
return AVERROR_INVALIDDATA;
for (c = 0; c < avctx->channels; ++c) {
if (use_acf) {
//acf_flag