[PATCH v3 18/32] target/sparc: Improve sparc_cpu_class_by_name()

[Gavin Shan]

Improve sparc_cpu_class_by_name() by validating @oc, to ensure it's
child of TYPE_SPARC_CPU since it's possible for other types of classes
to have TYPE_SPARC_CPU as the suffix of their type names.

Signed-off-by: Gavin Shan <gshan@redhat.com>
---
 target/sparc/cpu.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/target/sparc/cpu.c b/target/sparc/cpu.c
index 130ab8f578..20417707da 100644
--- a/target/sparc/cpu.c
+++ b/target/sparc/cpu.c
@@ -745,7 +745,12 @@ static ObjectClass *sparc_cpu_class_by_name(const char 
*cpu_model)
     typename = sparc_cpu_type_name(cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    return oc;
+    if (object_class_dynamic_cast(oc, TYPE_SPARC_CPU) &&
+        !object_class_is_abstract(oc)) {
+        return oc;
+    }
+
+    return NULL;
 }
 
 static void sparc_cpu_realizefn(DeviceState *dev, Error **errp)
-- 
2.41.0