diff options
| author | Michael Niedermayer <[email protected]> | 2019-07-26 15:26:08 +0200 |
|---|---|---|
| committer | Michael Niedermayer <[email protected]> | 2019-12-02 19:41:49 +0100 |
| commit | 92c75a313ec6d20418e25a4f1d08eb4d2383d4ec (patch) | |
| tree | 0502ec1087d265173d61f22e674974ba8331bb10 | |
| parent | 5818ae3cff3295185b3317065b4482e527623545 (diff) | |
avcodec/alsdec: Check for block_length <= 0 in read_var_block_data()
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 <[email protected]>
(cherry picked from commit be4fb282f9fb00d9c267dcc477745e2e468e758f)
Signed-off-by: Michael Niedermayer <[email protected]>
| -rw-r--r-- | libavcodec/alsdec.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index e93f44e2e0..1851296b05 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -647,7 +647,7 @@ 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; |