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avcodec/ac3dec: Fix: runtime error: index -1 out of bounds for type 'INTFLOAT [2]' 

It seems dual mono with a LFE channel is not forbidden

Fixes: 1570/clusterfuzz-testcase-minimized-6455337349545984

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c55e637072)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-14 14:42:45 +02:00
parent 04f39ac542
commit 220a2811c9
1 changed files with 1 additions and 1 deletions
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libavcodec/ac3dec.c
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@ -1341,7 +1341,7 @@ static int decode_audio_block(AC3DecodeContext *s, int blk)
for (ch = 1; ch <= s->channels; ch++) {
int audio_channel = 0;
INTFLOAT gain;
if (s->channel_mode == AC3_CHMODE_DUALMONO)
if (s->channel_mode == AC3_CHMODE_DUALMONO && ch <= 2)
audio_channel = 2-ch;
if (s->heavy_compression && s->compression_exists[audio_channel])
gain = s->heavy_dynamic_range[audio_channel];