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virXMLPropTristateSwitch: Always initialize '@result'

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Compilers aren't able to see whether @result is set or not and thus
don't warn of a potential use of uninitialized value. Always set @result
to prevent uninitialized use.

In two cases the code needed to be adjusted to preserve functionality.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Peter Krempa 2021-05-06 14:35:22 +02:00
parent f66d7461d4
commit 3a658e2d2f
2 changed files with 12 additions and 2 deletions
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10
src/conf/domain_conf.c
View File

@ -17443,12 +17443,15 @@ virDomainFeaturesDefParse(virDomainDef *def,
case VIR_DOMAIN_FEATURE_PVSPINLOCK:
case VIR_DOMAIN_FEATURE_VMPORT:
case VIR_DOMAIN_FEATURE_SMM: {
virTristateSwitch state = VIR_TRISTATE_SWITCH_ON;
virTristateSwitch state;
if (virXMLPropTristateSwitch(nodes[i], "state",
VIR_XML_PROP_NONE, &state) < 0)
return -1;
if (state == VIR_TRISTATE_SWITCH_ABSENT)
state = VIR_TRISTATE_SWITCH_ON;
def->features[val] = state;
break;
}
@ -17770,7 +17773,7 @@ virDomainFeaturesDefParse(virDomainDef *def,
return -1;
for (i = 0; i < n; i++) {
virTristateSwitch state = VIR_TRISTATE_SWITCH_ON;
virTristateSwitch state;
int val = virDomainProcessCapsFeatureTypeFromString((const char *)nodes[i]->name);
if (val < 0) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@ -17783,6 +17786,9 @@ virDomainFeaturesDefParse(virDomainDef *def,
&state) < 0)
return -1;
if (state == VIR_TRISTATE_SWITCH_ABSENT)
state = VIR_TRISTATE_SWITCH_ON;
def->caps_features[val] = state;
}
VIR_FREE(nodes);

4
src/util/virxml.c
View File

@ -630,6 +630,8 @@ virXMLPropTristateBool(xmlNodePtr node,
* @result: The returned value
*
* Convenience function to return value of an on / off attribute.
* In case when the property is missing @result is initialized to
* VIR_TRISTATE_SWITCH_ABSENT.
*
* Returns 1 in case of success in which case @result is set,
* or 0 if the attribute is not present,
@ -643,6 +645,8 @@ virXMLPropTristateSwitch(xmlNodePtr node,
{
flags |= VIR_XML_PROP_NONZERO;
*result = VIR_TRISTATE_SWITCH_ABSENT;
return virXMLPropEnumInternal(node, name, virTristateSwitchTypeFromString,
flags, result);
}