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alsdec: Check that quantized parcor coeffs are within range.

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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>
(cherry picked from commit 5b051ec3bd)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Michael Niedermayer
2012-02-29 06:10:17 +01:00
committed by Reinhard Tartler
parent aa45b90804
commit e3e369f696
1 changed files with 4 additions and 0 deletions
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4
libavcodec/alsdec.c
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@@ -704,6 +704,10 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
int rice_param = parcor_rice_table[sconf->coef_table][k][1]; int rice_param = parcor_rice_table[sconf->coef_table][k][1];
int offset = parcor_rice_table[sconf->coef_table][k][0]; int offset = parcor_rice_table[sconf->coef_table][k][0];
quant_cof[k] = decode_rice(gb, rice_param) + offset; 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 // read coefficients 20 to 126