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srsLTE
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chest_sl: fix some possible array access at negative index

This commit is contained in:
Andre Puschmann 2020-05-08 11:57:10 +02:00
parent cf9d31ea64
commit ca3b76df6e
1 changed files with 28 additions and 5 deletions
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33
lib/src/phy/ch_estimation/chest_sl.c
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@ -233,6 +233,12 @@ static void interpolate_pilots_sl_psbch(srslte_chest_sl_t* q)
}
}
// make sure l_idx is at least 2 to avoid accessing array at negative index below
if (l_idx < 2) {
ERROR("Couldn't interpolate PSBCH pilots. Invalid number of reference symbols.\n");
return;
}
for (uint32_t n = 0; n < l_idx; n++) {
ce_l[n] = SRSLTE_RE_IDX(q->cell.nof_prb, L[n], 0 * SRSLTE_NRE);
}
@ -282,7 +288,7 @@ static void chest_sl_psbch_ls_estimate(srslte_chest_sl_t* q, cf_t* sf_buffer)
// Get Pilot Estimates
// Use the known DMRS signal to compute least-squares estimates
bzero(q->ce, sizeof(cf_t) * sf_n_re);
srslte_vec_cf_zero(q->ce, sf_n_re);
for (uint32_t i = 0; i < sf_nsymbols; i++) {
if (srslte_psbch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, q->cell.tm, i, q->cell.cp)) {
srslte_vec_prod_conj_ccc(&sf_buffer[i * q->cell.nof_prb * SRSLTE_NRE + k],
@ -456,6 +462,12 @@ static void interpolate_pilots_sl_pscch(srslte_chest_sl_t* q)
}
}
// make sure l_idx is at least 2 to avoid accessing array at negative index below
if (l_idx < 2) {
ERROR("Couldn't interpolate PSCCH pilots. Invalid number of reference symbols.\n");
return;
}
for (uint32_t n = 0; n < l_idx; n++) {
ce_l[n] = SRSLTE_RE_IDX(q->cell.nof_prb, L[n], 0 * SRSLTE_NRE);
}
@ -499,7 +511,7 @@ static void chest_sl_pscch_ls_estimate(srslte_chest_sl_t* q, cf_t* sf_buffer)
{
// Get Pilot Estimates
// Use the known DMRS signal to compute least-squares estimates
bzero(q->ce, sizeof(cf_t) * q->sf_n_re);
srslte_vec_cf_zero(q->ce, q->sf_n_re);
uint32_t dmrs_idx = 0;
for (uint32_t i = 0; i < srslte_sl_get_num_symbols(q->cell.tm, q->cell.cp); i++) {
@ -743,6 +755,12 @@ static void interpolate_pilots_sl_pssch(srslte_chest_sl_t* q)
}
}
// make sure l_idx is at least 2 to avoid accessing array at negative index below
if (l_idx < 2) {
ERROR("Couldn't interpolate PSSCH pilots. Invalid number of reference symbols.\n");
return;
}
for (uint32_t n = 0; n < l_idx; n++) {
ce_l[n] = SRSLTE_RE_IDX(q->cell.nof_prb, L[n], 0 * SRSLTE_NRE);
}
@ -906,7 +924,7 @@ static void chest_sl_pssch_ls_estimate(srslte_chest_sl_t* q, cf_t* sf_buffer)
int dmrs_idx = 0;
uint32_t k = q->chest_sl_cfg.prb_start_idx * SRSLTE_NRE;
bzero(q->ce, sizeof(cf_t) * q->sf_n_re);
srslte_vec_cf_zero(q->ce, q->sf_n_re);
for (int i = 0; i < srslte_sl_get_num_symbols(q->cell.tm, q->cell.cp); i++) {
if (srslte_pssch_is_symbol(SRSLTE_SIDELINK_DMRS_SYMBOL, q->cell.tm, i, q->cell.cp)) {
@ -980,9 +998,14 @@ static void get_subband_noise(srslte_chest_sl_t* q, uint32_t k_start, uint32_t k
float srslte_chest_sl_estimate_noise(srslte_chest_sl_t* q)
{
q->noise_estimated = 0.0;
uint32_t sf_nsymbols = srslte_sl_get_num_symbols(q->cell.tm, q->cell.cp);
bzero(q->ce_average, sizeof(cf_t) * q->sf_n_re);
if (sf_nsymbols == 0) {
ERROR("Error estimating channel noise. Invalid number of OFDM symbols.\n");
return SRSLTE_ERROR;
}
srslte_vec_cf_zero(q->ce_average, q->sf_n_re);
q->noise_estimated = 0.0;
uint32_t k_start = 0;
uint32_t k_end = 0;