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avcodec/rka: avoid negative value shift
Fixes: left shift of negative value -81 Fixes: 56061/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RKA_fuzzer-4649758062149632 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 a5d4e7e3f981ce90b92a9da7da26a3c2a2e061e9) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -737,7 +737,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
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}
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ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1];
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} else {
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val <<= ctx->cmode;
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val *= 1 << ctx->cmode;
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sum += ctx->buf0[off + -1] + val;
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switch (s->bps) {
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case 16: sum = av_clip_int16(sum); break;
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