[libav-commits] alsdec: Check that quantized parcor coeffs are within range.

Michael Niedermayer git at libav.org
Fri Jan 4 08:09:20 CET 2013


Module: libav
Branch: release/0.7
Commit: e3e369f6962cb73ead3ca5d49a5cc313eb85e5fc

Author:    Michael Niedermayer <michaelni at gmx.at>
Committer: Reinhard Tartler <siretart at tauware.de>
Date:      Wed Feb 29 06:10:17 2012 +0100

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 at gmx.at>
Signed-off-by: Justin Ruggles <justin.ruggles at gmail.com>
(cherry picked from commit 5b051ec3bdc78f3d89e8d1425674cde8fd6c9ccc)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

---

 libavcodec/alsdec.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index cfe8fd3..4f4176e 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -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 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



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