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motech-lps-30x: fix several compiler warnings 

Check pointers' validity before dereferencing them. Explicitly assign a
default value to variables, before conversion routines conditionally
assign the "real" value (and don't in case of conversion errors). This
avoids processing "garbage" data.

Strictly speaking I cannot see how the conversion routine returns OK and
has _not_ assigned a result. But the explicit assignment won't harm
either, and matches the fallback when the conversion fails (detectibly).
Which means that runtime behaviour won't change.

This was reported by clang's scan-build.
This commit is contained in:
Gerhard Sittig 2018-02-09 19:17:13 +01:00 committed by Uwe Hermann
parent fe535a89c9
commit e4924d752b
2 changed files with 10 additions and 0 deletions
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6
src/hardware/motech-lps-30x/api.c
View File

@ -650,6 +650,8 @@ static int config_list(uint32_t key, GVariant **data,
case SR_CONF_DEVICE_OPTIONS:
return STD_CONFIG_LIST(key, data, sdi, cg, scanopts, drvopts, devopts);
case SR_CONF_CHANNEL_CONFIG:
if (!devc || !devc->model)
return SR_ERR_ARG;
if (devc->model->modelid <= LPS_303) {
/* The 1-channel models. */
*data = g_variant_new_strv(channel_modes, 1);
@ -675,9 +677,13 @@ static int config_list(uint32_t key, GVariant **data,
*data = std_gvar_array_u32(ARRAY_AND_SIZE(devopts_cg_ch3));
break;
case SR_CONF_VOLTAGE_TARGET:
if (!devc || !devc->model)
return SR_ERR_ARG;
*data = std_gvar_min_max_step_array(devc->model->channels[ch_idx].voltage);
break;
case SR_CONF_CURRENT_LIMIT:
if (!devc || !devc->model)
return SR_ERR_ARG;
*data = std_gvar_min_max_step_array(devc->model->channels[ch_idx].current);
break;
default:

4
src/hardware/motech-lps-30x/protocol.c
View File

@ -76,6 +76,8 @@ static void process_line(struct sr_dev_inst *sdi)
int auxint;
devc = sdi->priv;
if (!devc)
return;
switch (devc->acq_req_pending) {
case 0: /* Should not happen... */
@ -87,6 +89,7 @@ static void process_line(struct sr_dev_inst *sdi)
case AQ_U2:
case AQ_I1:
case AQ_I2:
dbl = 0.0;
if (sr_atod_ascii(devc->buf, &dbl) != SR_OK) {
sr_err("Failed to convert '%s' to double, errno=%d %s",
devc->buf, errno, g_strerror(errno));
@ -94,6 +97,7 @@ static void process_line(struct sr_dev_inst *sdi)
}
break;
case AQ_STATUS:
auxint = 0;
if (sr_atoi(devc->buf, &auxint) != SR_OK) {
sr_err("Failed to convert '%s' to int, errno=%d %s",
devc->buf, errno, g_strerror(errno));