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avcodec/qdm2: Check fft_coefs_index 

Fixes: out of array access
Fixes: 20660/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_QDM2_fuzzer-5658290216501248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-02-18 22:58:12 +01:00
parent bb01baae26
commit 9fc73bf022
1 changed files with 3 additions and 0 deletions
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libavcodec/qdm2.c
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@ -1334,6 +1334,9 @@ static void qdm2_fft_decode_tones(QDM2Context *q, int duration,
if (q->frequency_range > (local_int_14 + 1)) {
int sub_packet = (local_int_20 + local_int_28);
if (q->fft_coefs_index + stereo >= FF_ARRAY_ELEMS(q->fft_coefs))
return;
qdm2_fft_init_coefficient(q, sub_packet, offset, duration,
channel, exp, phase);
if (stereo)