Merge commit '59480abce7e4238e22b3a4a904a9fe6abf4e4188'

* commit '59480abce7e4238e22b3a4a904a9fe6abf4e4188':
  alac: Do bounds checking of lpc_order read from the bitstream

See: fd4f4923cc
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/alac.c

@@ -320,6 +320,9 @@ static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
             rice_history_mult[ch] = get_bits(&alac->gb, 3);
             lpc_order[ch]         = get_bits(&alac->gb, 5);
 
+            if (lpc_order[ch] >= alac->max_samples_per_frame)
+                return AVERROR_INVALIDDATA;
+
             /* read the predictor table */
             for (i = lpc_order[ch] - 1; i >= 0; i--)
                 lpc_coefs[ch][i] = get_sbits(&alac->gb, 16);