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avcodec/ralf: Fix integer overflow in apply_lpc()

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Fixes: signed integer overflow: 2147482897 + 2048 cannot be represented in type 'int'
Fixes: 19240/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5743240326414336
Fixes: 19869/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5150136636538880

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 fd313d8cf8368918882b6de0880e44ae25cc7394)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-08 13:48:45 +01:00
parent af1bfe5bc3
commit 9f30a1694c
1 changed files with 1 additions and 1 deletions
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libavcodec/ralf.c
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@ -330,7 +330,7 @@ static void apply_lpc(RALFContext *ctx, int ch, int length, int bits)
acc = (acc + bias - 1) >> ctx->filter_bits; acc = (acc + bias - 1) >> ctx->filter_bits;
acc = FFMAX(acc, min_clip); acc = FFMAX(acc, min_clip);
} else { } else {
acc = (acc + bias) >> ctx->filter_bits; acc = ((unsigned)acc + bias) >> ctx->filter_bits;
acc = FFMIN(acc, max_clip); acc = FFMIN(acc, max_clip);
} }
audio[i] += acc; audio[i] += acc;