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Prevent signed integer overflows in ELD filterbank, multE2_DinvF_fdk().

Browse Source 
Bug: 145669388
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: Iaba69b58666833c90e05b296c502ba6509a087a9
This commit is contained in:
Fraunhofer IIS FDK 2019-10-29 13:06:16 +01:00 committed by Jean-Michel Trivi
parent 68cdcfc6b8
commit 089d368ddb
1 changed files with 11 additions and 7 deletions
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18
libAACdec/src/ldfiltbank.cpp
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@ -1,7 +1,7 @@
/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.
1. INTRODUCTION
@ -131,10 +131,12 @@ static void multE2_DinvF_fdk(FIXP_PCM *output, FIXP_DBL *x, const FIXP_WTB *fb,
FIXP_DBL z0, z2, tmp;
z2 = x[N / 2 + i];
z0 = z2 + (fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1));
z0 = fAddSaturate(z2,
(fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1)));
z[N / 2 + i] = x[N / 2 - 1 - i] +
(fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1));
z[N / 2 + i] = fAddSaturate(
x[N / 2 - 1 - i],
(fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1)));
tmp = (fMultDiv2(z[N / 2 + i], fb[N + N / 2 - 1 - i]) +
fMultDiv2(z[i], fb[N + N / 2 + i]));
@ -159,10 +161,12 @@ static void multE2_DinvF_fdk(FIXP_PCM *output, FIXP_DBL *x, const FIXP_WTB *fb,
FIXP_DBL z0, z2, tmp0, tmp1;
z2 = x[N / 2 + i];
z0 = z2 + (fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1));
z0 = fAddSaturate(z2,
(fMultDiv2(z[N / 2 + i], fb[2 * N + i]) >> (-WTS2 - 1)));
z[N / 2 + i] = x[N / 2 - 1 - i] +
(fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1));
z[N / 2 + i] = fAddSaturate(
x[N / 2 - 1 - i],
(fMultDiv2(z[N + i], fb[2 * N + N / 2 + i]) >> (-WTS2 - 1)));
tmp0 = (fMultDiv2(z[N / 2 + i], fb[N / 2 - 1 - i]) +
fMultDiv2(z[i], fb[N / 2 + i]));