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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>
This commit is contained in:
Michael Niedermayer 2023-02-20 20:04:18 +01:00
parent 8874cfa2e1
commit a5d4e7e3f9
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1 changed files with 1 additions and 1 deletions
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libavcodec/rka.c
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@ -737,7 +737,7 @@ static int decode_filter(RKAContext *s, ChContext *ctx, ACoder *ac, int off, uns
}
ctx->buf0[off] = ctx->buf1[off] + ctx->buf0[off + -1];
} else {
val <<= ctx->cmode;
val *= 1 << ctx->cmode;
sum += ctx->buf0[off + -1] + val;
switch (s->bps) {
case 16: sum = av_clip_int16(sum); break;