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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-25 18:22:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2019-09-11 22:43:14 +0200 |
| commit | e1255789941d213a8e193469d0687946c9fa4a63 (patch) | |
| tree | b54e16e12855debafbf0efa66e2ae6c2121762ed /libavcodec/alsdec.c | |
| parent | f1192736494a5b16717de66da4a3d3c6af0e9a7a (diff) | |
| download | ffmpeg-e1255789941d213a8e193469d0687946c9fa4a63.tar.gz | |
avcodec/alsdec: Check k from being outside what our implementation can handle
The specification does not seem to list what the maximum valid
value is
Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 16268/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ALS_fuzzer-5638164544225280
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/alsdec.c')
| -rw-r--r-- | libavcodec/alsdec.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c index f8d10df8c6..a53c170d18 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -833,6 +833,9 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) k [sb] = s[sb] > b ? s[sb] - b : 0; delta[sb] = 5 - s[sb] + k[sb]; + if (k[sb] >= 32) + return AVERROR_INVALIDDATA; + ff_bgmc_decode(gb, sb_len, current_res, delta[sb], sx[sb], &high, &low, &value, ctx->bgmc_lut, ctx->bgmc_lut_status); |