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| author | Michael Niedermayer <michaelni@gmx.at> | 2012-02-29 06:10:17 +0100 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2012-09-17 14:17:27 -0400 |
| commit | 5b051ec3bdc78f3d89e8d1425674cde8fd6c9ccc (patch) | |
| tree | ba4eb68cd0f8a2ec4eb6b1a67703bd6bf980fed8 | |
| parent | 9853e41aa0a6cfff629ff7009685eb8bf8d64e7f (diff) | |
| download | ffmpeg-5b051ec3bdc78f3d89e8d1425674cde8fd6c9ccc.tar.gz | |
alsdec: Check that quantized parcor coeffs are within range.
ALS spec:
11.6.3.1.1 Quantization and encoding of parcor coefficients
...
In all cases the resulting quantized values ak are restricted to the range [-64,63].
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
| -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 defe3c4850..b4bc41bee1 100644 --- a/libavcodec/alsdec.c +++ b/libavcodec/alsdec.c @@ -705,6 +705,10 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd) int rice_param = parcor_rice_table[sconf->coef_table][k][1]; int offset = parcor_rice_table[sconf->coef_table][k][0]; quant_cof[k] = decode_rice(gb, rice_param) + offset; + if (quant_cof[k] < -64 || quant_cof[k] > 63) { + av_log(avctx, AV_LOG_ERROR, "quant_cof %d is out of range\n", quant_cof[k]); + return AVERROR_INVALIDDATA; + } } // read coefficients 20 to 126 |