diff options
| author | Michael Niedermayer <[email protected]> | 2019-08-25 18:22:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <[email protected]> | 2019-12-06 20:30:57 +0100 |
| commit | 668d797a5723403613c31b103ce3c511cdb95c8b (patch) | |
| tree | 21197a4a8b2122dec42f23fcef3d14948c5b305f | |
| parent | 80d27aaf7078fbc0ab4ce42500748facb025859d (diff) | |
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 <[email protected]>
(cherry picked from commit e1255789941d213a8e193469d0687946c9fa4a63)
Signed-off-by: Michael Niedermayer <[email protected]>
| -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 5716b5e709..320bd84775 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -828,6 +828,9 @@ 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); |