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avcodec/alsdec: Clear shift_value

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(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>
(cherry picked from commit 6194cb87cb)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2024-07-19 17:08:22 +02:00
parent 4841d48e04
commit f175858f10
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1 changed files with 2 additions and 2 deletions
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4
libavcodec/alsdec.c
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@ -2110,8 +2110,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
if (sconf->floating) { if (sconf->floating) {
ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf)); ctx->acf = av_malloc_array(channels, sizeof(*ctx->acf));
ctx->shift_value = av_malloc_array(channels, sizeof(*ctx->shift_value)); ctx->shift_value = av_calloc(channels, sizeof(*ctx->shift_value));
ctx->last_shift_value = av_malloc_array(channels, sizeof(*ctx->last_shift_value)); ctx->last_shift_value = av_calloc(channels, sizeof(*ctx->last_shift_value));
ctx->last_acf_mantissa = av_malloc_array(channels, sizeof(*ctx->last_acf_mantissa)); ctx->last_acf_mantissa = av_malloc_array(channels, sizeof(*ctx->last_acf_mantissa));
ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa)); ctx->raw_mantissa = av_calloc(channels, sizeof(*ctx->raw_mantissa));