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Fix for the Divide-by-zero in iusace_tcx_fac_encode

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These changes handle the Divide-by-zero runtime error
reported by correcting the TCX pre-shaping and
shaping related parameters.

Bug: ossFuzz:61899
Test: poc in bug
This commit is contained in:
Akshay Ragir 2023-09-01 19:48:23 +05:30 • committed by Divya B M
parent 29d968bd4c
commit a00a8d3c2c
1 changed files with 7 additions and 7 deletions
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14
encoder/iusace_tcx_enc.c
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@ -157,18 +157,18 @@ UWORD32 iusace_rounded_sqrt(UWORD32 pos_num) {
return value;
}
static VOID iusace_noise_shaping(FLOAT32 *rr, WORD32 lg, FLOAT32 *gain1, FLOAT32 *gain2) {
static VOID iusace_noise_shaping(FLOAT32 *rr, WORD32 lg, WORD32 M, FLOAT32 *gain1,
FLOAT32 *gain2) {
WORD32 i, k;
FLOAT32 r, r_prev, g1, g2, a = 0, b = 0;
k = lg / FDNS_RESOLUTION;
k = lg/M;
r_prev = 0;
for (i = 0; i < lg; i++) {
if ((i % k) == 0) {
g1 = gain1[i / k];
g2 = gain2[i / k];
a = 2.0f * g1 * g2 / (g1 + g2);
b = (g2 - g1) / (g1 + g2);
}
@ -182,11 +182,11 @@ static VOID iusace_noise_shaping(FLOAT32 *rr, WORD32 lg, FLOAT32 *gain1, FLOAT32
return;
}
static VOID iusace_pre_shaping(FLOAT32 *rr, WORD32 lg, FLOAT32 *gain1, FLOAT32 *gain2) {
static VOID iusace_pre_shaping(FLOAT32 *rr, WORD32 lg, WORD32 M, FLOAT32 *gain1, FLOAT32 *gain2) {
WORD32 i, k;
FLOAT32 r, r_prev, g1, g2, a = 0, b = 0;
k = lg / FDNS_RESOLUTION;
k = lg / M;
r_prev = 0;
for (i = 0; i < lg; i++) {
@ -439,7 +439,7 @@ VOID iusace_tcx_fac_encode(ia_usac_data_struct *usac_data, FLOAT32 *lpc_coeffs,
iusace_lpc_mdct(lp_flt_coeffs, gain2, ((FDNS_RESOLUTION * len_subfrm) / LEN_FRAME) << 1,
pstr_scratch);
iusace_pre_shaping(x, lg, gain1, gain2);
iusace_pre_shaping(x, lg, ((FDNS_RESOLUTION * len_subfrm) / LEN_FRAME), gain1, gain2);
for (i = 0; i < lg; i++) {
x_tmp[i] = x[i];
@ -584,7 +584,7 @@ VOID iusace_tcx_fac_encode(ia_usac_data_struct *usac_data, FLOAT32 *lpc_coeffs,
params[0] = index;
iusace_noise_shaping(x, lg, gain1, gain2);
iusace_noise_shaping(x, lg, ((FDNS_RESOLUTION * len_subfrm) / LEN_FRAME), gain1, gain2);
iusace_tcx_imdct(x, xn_buf, (2 * fac_length), frame_len - (2 * fac_length), (2 * fac_length),
pstr_scratch);