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Ignore some UBSan errors

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They proved to be too difficult to fix properly, so we revert the
saturation fixes that were done in
https://codereview.webrtc.org/2729573002 and
https://codereview.webrtc.org/2746903002, and ignore them instead.

BUG=webrtc:7307, chromium:709364, chromium:693868

Review-Url: https://codereview.webrtc.org/2809483002
Cr-Commit-Position: refs/heads/master@{#17612}
This commit is contained in:
kwiberg
2017-04-10 02:29:33 -07:00
committed by Commit bot
parent 9f2c18e237
commit 49cad02cf3
2 changed files with 28 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
webrtc/modules/audio_coding/codecs/isac/fix/source/entropy_coding.c
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@ -26,7 +26,7 @@
#include "lpc_tables.h"
#include "settings.h"
#include "signal_processing_library.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/sanitizer.h"
/*
* Eenumerations for arguments to functions WebRtcIsacfix_MatrixProduct1()
@ -189,6 +189,22 @@ static void CalcCorrelation(int32_t *PSpecQ12, int32_t *CorrQ7)
}
}
// Some arithmetic operations that are allowed to overflow. (It's still
// undefined behavior, so not a good idea; this just makes UBSan ignore the
// violations, so that our old code can continue to do what it's always been
// doing.)
static inline int32_t OverflowingMulS16S32ToS32(int16_t a, int32_t b)
RTC_NO_SANITIZE("signed-integer-overflow") {
return a * b;
}
static inline int32_t OverflowingAddS32S32ToS32(int32_t a, int32_t b)
RTC_NO_SANITIZE("signed-integer-overflow") {
return a + b;
}
static inline int32_t OverflowingSubS32S32ToS32(int32_t a, int32_t b)
RTC_NO_SANITIZE("signed-integer-overflow") {
return a - b;
}
/* compute inverse AR power spectrum */
static void CalcInvArSpec(const int16_t *ARCoefQ12,
@ -231,11 +247,11 @@ static void CalcInvArSpec(const int16_t *ARCoefQ12,
CurveQ16[n] = sum;
for (k = 1; k < AR_ORDER; k += 2) {
for (n = 0; n < FRAMESAMPLES/8; n++) {
const int64_t p =
(WebRtcIsacfix_kCos[k][n] * (int64_t)CorrQ11[k + 1] + 2) >> 2;
CurveQ16[n] += WebRtcSpl_SatW64ToW32(p);
}
for (n = 0; n < FRAMESAMPLES/8; n++)
CurveQ16[n] +=
(OverflowingMulS16S32ToS32(WebRtcIsacfix_kCos[k][n], CorrQ11[k + 1]) +
2) >>
2;
}
CS_ptrQ9 = WebRtcIsacfix_kCos[0];
@ -261,8 +277,8 @@ static void CalcInvArSpec(const int16_t *ARCoefQ12,
for (k=0; k<FRAMESAMPLES/8; k++) {
int32_t diff_q16 = diffQ16[k] * (1 << shftVal);
CurveQ16[FRAMESAMPLES / 4 - 1 - k] =
WebRtcSpl_SubSatW32(CurveQ16[k], diff_q16);
CurveQ16[k] = WebRtcSpl_AddSatW32(CurveQ16[k], diff_q16);
OverflowingSubS32S32ToS32(CurveQ16[k], diff_q16);
CurveQ16[k] = OverflowingAddS32S32ToS32(CurveQ16[k], diff_q16);
}
}
@ -497,10 +513,8 @@ int WebRtcIsacfix_DecodeSpec(Bitstr_dec *streamdata,
{
for (k = 0; k < FRAMESAMPLES; k += 4)
{
gainQ10 = WebRtcSpl_DivW32W16ResW16(
30 << 10, (int16_t)((uint32_t)(WebRtcSpl_AddSatW32(
invARSpec2_Q16[k >> 2], 2195456)) >>
16));
gainQ10 = WebRtcSpl_DivW32W16ResW16(30 << 10,
(int16_t)((uint32_t)(invARSpec2_Q16[k >> 2] + 2195456) >> 16));
*frQ7++ = (int16_t)((data[k] * gainQ10 + 512) >> 10);
*fiQ7++ = (int16_t)((data[k + 1] * gainQ10 + 512) >> 10);
*frQ7++ = (int16_t)((data[k + 2] * gainQ10 + 512) >> 10);
@ -511,10 +525,8 @@ int WebRtcIsacfix_DecodeSpec(Bitstr_dec *streamdata,
{
for (k = 0; k < FRAMESAMPLES; k += 4)
{
gainQ10 = WebRtcSpl_DivW32W16ResW16(
36 << 10, (int16_t)((uint32_t)(WebRtcSpl_AddSatW32(
invARSpec2_Q16[k >> 2], 2654208)) >>
16));
gainQ10 = WebRtcSpl_DivW32W16ResW16(36 << 10,
(int16_t)((uint32_t)(invARSpec2_Q16[k >> 2] + 2654208) >> 16));
*frQ7++ = (int16_t)((data[k] * gainQ10 + 512) >> 10);
*fiQ7++ = (int16_t)((data[k + 1] * gainQ10 + 512) >> 10);
*frQ7++ = (int16_t)((data[k + 2] * gainQ10 + 512) >> 10);