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| author | Michael Niedermayer <michael@niedermayer.cc> | 2021-03-01 23:24:37 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2021-09-10 16:04:26 +0200 |
| commit | db0a8edfe8ff5f6640a3edce36a860259b2d38e3 (patch) | |
| tree | 62381c057ef268e8382fc37dc37678b966f3d756 | |
| parent | 6b0a5c67417f8a428c39d568622c2447e748cd00 (diff) | |
| download | ffmpeg-db0a8edfe8ff5f6640a3edce36a860259b2d38e3.tar.gz | |
avcodec/alsdec: Check bitstream input in read_block()
Fixes: Timeout
Fixes: 28110/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5036338973507584
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 53d739db4e528388fae89459e887a633ffbce12c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavcodec/alsdec.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index 0fd7278ad8..6f3311356d 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -1015,6 +1015,10 @@ static int read_block(ALSDecContext *ctx, ALSBlockData *bd) ALSSpecificConfig *sconf = &ctx->sconf; *bd->shift_lsbs = 0; + + if (get_bits_left(gb) < 1) + return AVERROR_INVALIDDATA; + // read block type flag and read the samples accordingly if (get_bits1(gb)) { ret = read_var_block_data(ctx, bd); |