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avcodec/ralf: Fix integer overflow in apply_lpc()

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Fixes: signed integer overflow: 1603085316 + 1238786562 cannot be represented in type 'int'
Fixes: 16203/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5086088934195200

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 ccca484324)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-08-04 17:20:45 +02:00
parent 78ec060eda
commit 240c7ec6bf
1 changed files with 1 additions and 1 deletions
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libavcodec/ralf.c
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@@ -323,7 +323,7 @@ static void apply_lpc(RALFContext *ctx, int ch, int length, int bits)
acc = 0;
for (j = 0; j < flen; j++)
acc += ctx->filter[j] * audio[i - j - 1];
acc += (unsigned)ctx->filter[j] * audio[i - j - 1];
if (acc < 0) {
acc = (acc + bias - 1) >> ctx->filter_bits;
acc = FFMAX(acc, min_clip);