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avcodec/alsdec: Check for block_length <= 0 in read_var_block_data()

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Fixes: left shift of negative value -1
Fixes: 15719/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5685731105701888

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 2019-07-26 15:26:08 +02:00
parent 02f909dc24
commit be4fb282f9
1 changed files with 1 additions and 1 deletions
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2
libavcodec/alsdec.c
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@ -657,7 +657,7 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
// do not continue in case of a damaged stream since
// block_length must be evenly divisible by sub_blocks
if (bd->block_length & (sub_blocks - 1)) {
if (bd->block_length & (sub_blocks - 1) || bd->block_length <= 0) {
av_log(avctx, AV_LOG_WARNING,
"Block length is not evenly divisible by the number of subblocks.\n");
return AVERROR_INVALIDDATA;