avcodec/atrac9dec: Don't create VLCs that are never used

[ffmpeg] / libavcodec / alac.c

diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index bf054062300a70741867bc8c523138caeb1f8318..9040673528a3d63637652186f8afa687530f9d64 100644 (file)
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -302,6 +302,9 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
         decorr_shift       = get_bits(&alac->gb, 8);
         decorr_left_weight = get_bits(&alac->gb, 8);
 
+        if (channels == 2 && decorr_left_weight && decorr_shift > 31)
+            return AVERROR_INVALIDDATA;
+
         for (ch = 0; ch < channels; ch++) {
             prediction_type[ch]   = get_bits(&alac->gb, 4);
             lpc_quant[ch]         = get_bits(&alac->gb, 4);