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avcodec/rka: avoid undefined multiply in cmode==0
Fixes: signed integer overflow: -182838 * 32768 cannot be represented in type 'int' Fixes: 58179/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-5333265899978752 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -732,7 +732,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
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if (bits == 0) {
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ctx->buf1[off] = sum + val;
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} else {
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ctx->buf1[off] = (val + (sum >> bits)) * (1 << bits) +
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ctx->buf1[off] = (val + (sum >> bits)) * (1U << bits) +
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(((1U << bits) - 1U) & ctx->buf1[off + -1]);
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}
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ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1];
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