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avcodec/alsdec: Fix integer overflow in decode_var_block_data()

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Fixes: signed integer overflow: 1927975249 - -514719744 cannot be represented in type 'int'
Fixes: 16413/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5651206856245248

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Thilo Borgmann <thilo.borgmann@mail.de>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-19 01:30:53 +02:00
parent d7866bf527
commit 661a9b274b
1 changed files with 1 additions and 1 deletions
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libavcodec/alsdec.c
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@ -951,7 +951,7 @@ static int decode_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
// reconstruct difference signal for prediction (joint-stereo)
if (bd->js_blocks && bd->raw_other) {
int32_t *left, *right;
uint32_t *left, *right;
if (bd->raw_other > raw_samples) { // D = R - L
left = raw_samples;