From c55e637072b694a1db40e21948d218bfa2e744bb Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 14 May 2017 14:42:45 +0200
Subject: [PATCH] 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>
---
libavcodec/ac3dec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index ffea9d335c3..c393076aec2 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -1389,7 +1389,7 @@ 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];
--
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