[FFmpeg-cvslog] alsdec: Check that quantized parcor coeffs are within range.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Wed Feb 29 06:10:17 2012 +0100| [8534881a389044ec51adabcf979616b4875ac072] | committer: Michael Niedermayer

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>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8534881a389044ec51adabcf979616b4875ac072
---

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

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 84ed4cf..8abba60 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -695,6 +695,10 @@ 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