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| author | Michael Niedermayer <michael@niedermayer.cc> | 2019-08-25 18:22:50 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-01 12:49:26 +0200 |
| commit | f775712d67b1dffde16235be0be7b30d39000971 (patch) | |
| tree | 705a56bef1c9842643ebca888a5c8e1361842be9 | |
| parent | eccef3a6f9673897770c2622d5843e4ae43ee9d6 (diff) | |
| download | ffmpeg-f775712d67b1dffde16235be0be7b30d39000971.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>
(cherry picked from commit e1255789941d213a8e193469d0687946c9fa4a63)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -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 d30ee8374e..042f554ff6 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -839,6 +839,9 @@ 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); |