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s390x/cpumodel: Fix query-cpu-definitions error API violations 

qmp_query_cpu_definitions() passes @errp to get_max_cpu_model(), then
frees any error it gets back.  This effectively ignores errors.
Dereferencing @errp is wrong; see the big comment in error.h.  Passing
@errp is also wrong, because it works only as long as @errp is neither
@error_fatal nor @error_abort.  Introduced in commit 38cba1f4d8
"s390x: return unavailable features via query-cpu-definitions".

No caller actually passes such @errp values.

Fix anyway: simply pass NULL to get_max_cpu_model().

Cc: David Hildenbrand <david@redhat.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Message-Id: <20191204093625.14836-16-armbru@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Markus Armbruster 2019-12-04 10:36:22 +01:00 committed by Cornelia Huck
parent e47970f51d
commit 7dcb1baeae
1 changed files with 1 additions and 5 deletions
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6
target/s390x/cpu_models.c
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@ -462,11 +462,7 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
.list = NULL,
};
list_data.model = get_max_cpu_model(errp);
if (*errp) {
error_free(*errp);
*errp = NULL;
}
list_data.model = get_max_cpu_model(NULL);
object_class_foreach(create_cpu_model_list, TYPE_S390_CPU, false,
&list_data);