Move UBSan warnings from a blacklist to the source

webrtc/common_audio/signal_processing/division_operations.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 implementations of the divisions
  * WebRtcSpl_DivU32U16()
  * WebRtcSpl_DivW32W16()
  * WebRtcSpl_DivW32W16ResW16()
  * WebRtcSpl_DivResultInQ31()
  * WebRtcSpl_DivW32HiLow()
  *
  * 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"
 
 uint32_t WebRtcSpl_DivU32U16(uint32_t num, uint16_t den)
 {
     // Guard against division with 0
     if (den != 0)
     {
         return (uint32_t)(num / den);
     } else
     {
         return (uint32_t)0xFFFFFFFF;
@@ skipping 55 matching lines @@
             div++;
         }
     }
     if (change_sign == 1)
     {
         div = -div;
     }
     return div;
 }
 
-int32_t WebRtcSpl_DivW32HiLow(int32_t num, int16_t den_hi, int16_t den_low)
+int32_t RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_DivW32HiLow(int32_t num, int16_t den_hi, int16_t den_low)
 {
     int16_t approx, tmp_hi, tmp_low, num_hi, num_low;
     int32_t tmpW32;
 
     approx = (int16_t)WebRtcSpl_DivW32W16((int32_t)0x1FFFFFFF, den_hi);
     // result in Q14 (Note: 3FFFFFFF = 0.5 in Q30)
 
     // tmpW32 = 1/den = approx * (2.0 - den * approx) (in Q30)
     tmpW32 = (den_hi * approx << 1) + ((den_low * approx >> 15) << 1);
     // tmpW32 = den * approx
 
     tmpW32 = (int32_t)0x7fffffffL - tmpW32; // result in Q30 (tmpW32 = 2.0-(den*approx))
+    // UBSan: 2147483647 - -2 cannot be represented in type 'int'
 
     // Store tmpW32 in hi and low format
     tmp_hi = (int16_t)(tmpW32 >> 16);
     tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
 
     // tmpW32 = 1/den in Q29
     tmpW32 = (tmp_hi * approx + (tmp_low * approx >> 15)) << 1;
 
     // 1/den in hi and low format
     tmp_hi = (int16_t)(tmpW32 >> 16);
     tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
 
     // Store num in hi and low format
     num_hi = (int16_t)(num >> 16);
     num_low = (int16_t)((num - ((int32_t)num_hi << 16)) >> 1);
 
     // num * (1/den) by 32 bit multiplication (result in Q28)
 
     tmpW32 = num_hi * tmp_hi + (num_hi * tmp_low >> 15) +
         (num_low * tmp_hi >> 15);
 
     // Put result in Q31 (convert from Q28)
     tmpW32 = WEBRTC_SPL_LSHIFT_W32(tmpW32, 3);
 
     return tmpW32;
 }