Move UBSan warnings from a blacklist to the source

webrtc/common_audio/signal_processing/levinson_durbin.c

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 
 /*
  * This file contains the function WebRtcSpl_LevinsonDurbin().
  * The description header can be found in signal_processing_library.h
  *
  */
 
 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+#include "webrtc/rtc_base/sanitizer.h"
 
 #define SPL_LEVINSON_MAXORDER 20
 
-int16_t WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
-                                 size_t order)
+int16_t RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_LevinsonDurbin(const int32_t* R, int16_t* A, int16_t* K,
+                         size_t order)
 {
     size_t i, j;
     // Auto-correlation coefficients in high precision
     int16_t R_hi[SPL_LEVINSON_MAXORDER + 1], R_low[SPL_LEVINSON_MAXORDER + 1];
     // LPC coefficients in high precision
     int16_t A_hi[SPL_LEVINSON_MAXORDER + 1], A_low[SPL_LEVINSON_MAXORDER + 1];
     // LPC coefficients for next iteration
     int16_t A_upd_hi[SPL_LEVINSON_MAXORDER + 1], A_upd_low[SPL_LEVINSON_MAXORDER + 1];
     // Reflection coefficient in high precision
     int16_t K_hi, K_low;
     // Prediction gain Alpha in high precision and with scale factor
     int16_t Alpha_hi, Alpha_low, Alpha_exp;
     int16_t tmp_hi, tmp_low;
     int32_t temp1W32, temp2W32, temp3W32;
     int16_t norm;
 
     // Normalize the autocorrelation R[0]...R[order+1]
 
     norm = WebRtcSpl_NormW32(R[0]);
 
     for (i = 0; i <= order; ++i)
     {
         temp1W32 = R[i] * (1 << norm);
+        // UBSan: 12 * 268435456 cannot be represented in type 'int'
+
         // Put R in hi and low format
         R_hi[i] = (int16_t)(temp1W32 >> 16);
         R_low[i] = (int16_t)((temp1W32 - ((int32_t)R_hi[i] * 65536)) >> 1);
     }
 
     // K = A[1] = -R[1] / R[0]
 
     temp2W32 = R[1] * (1 << norm); // R[1] in Q31
     temp3W32 = WEBRTC_SPL_ABS_W32(temp2W32); // abs R[1]
     temp1W32 = WebRtcSpl_DivW32HiLow(temp3W32, R_hi[0], R_low[0]); // abs(R[1])/R[0] in Q31
@@ skipping 179 matching lines @@
     for (i = 1; i <= order; i++)
     {
         // temp1W32 in Q27
         temp1W32 = (int32_t)A_hi[i] * 65536
                 + WEBRTC_SPL_LSHIFT_W32((int32_t)A_low[i], 1);
         // Round and store upper word
         A[i] = (int16_t)(((temp1W32 * 2) + 32768) >> 16);
     }
     return 1; // Stable filters
 }