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avcodec/alsdec: Clear shift_value
(the exact issue is unreproducable but the use of uninitialized data is reproducable) Should fix: signed integer overflow: -2147483648 - 127 cannot be represented in type 'int' Should fix: 69881/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-4751301204836352 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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@ -2110,8 +2110,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
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if (sconf->floating) {
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ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf));
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ctx->shift_value = av_malloc_array(channels, sizeof(*ctx->shift_value));
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ctx->last_shift_value = av_malloc_array(channels, sizeof(*ctx->last_shift_value));
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ctx->shift_value = av_calloc(channels, sizeof(*ctx->shift_value));
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ctx->last_shift_value = av_calloc(channels, sizeof(*ctx->last_shift_value));
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ctx->last_acf_mantissa = av_malloc_array(channels, sizeof(*ctx->last_acf_mantissa));
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ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa));
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