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Prevent signed integer overflow in filtLP().

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Bug: 131430997
Test: atest DecoderTestXheAac ; atest DecoderTestAacDrc
Change-Id: I8da32f4794274e2955936ccd42c009485fbe1972
This commit is contained in:
Fraunhofer IIS FDK 2019-10-18 14:03:21 +02:00 committed by Jean-Michel Trivi
parent 9ba6f8b6a2
commit ea9d3a049b
1 changed files with 4 additions and 3 deletions
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7
libAACdec/src/usacdec_lpd.cpp
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@ -1,7 +1,7 @@
/* ----------------------------------------------------------------------------- /* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android 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. Forschung e.V. All rights reserved.
1. INTRODUCTION 1. INTRODUCTION
@ -130,9 +130,10 @@ void filtLP(const FIXP_DBL *syn, FIXP_PCM *syn_out, FIXP_DBL *noise,
for (i = 0; i < stop; i++) { for (i = 0; i < stop; i++) {
tmp = fMultDiv2(noise[i], filt[0]); // Filt in Q-1.16 tmp = fMultDiv2(noise[i], filt[0]); // Filt in Q-1.16
for (j = 1; j <= len; j++) { for (j = 1; j <= len; j++) {
tmp += fMultDiv2((noise[i - j] + noise[i + j]), filt[j]); tmp += fMult((noise[i - j] >> 1) + (noise[i + j] >> 1), filt[j]);
} }
syn_out[i] = (FIXP_PCM)(IMDCT_SCALE(syn[i] - tmp)); syn_out[i] = (FIXP_PCM)(SATURATE_SHIFT(
(syn[i] >> 1) - (tmp >> 1), (MDCT_OUTPUT_SCALE - 1), PCM_OUT_BITS));
} }
} }