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qom: dynamic_cast of NULL is always NULL 

Trying to cast a NULL value will cause a crash.  Returning
NULL is also sensible, and it is also what the type-unsafe
DO_UPCAST macro does.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit b7f43fe460)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Paolo Bonzini 2012-11-23 16:56:17 +01:00 committed by Michael Roth
parent 4fb9656b9d
commit 5e19e498b4
1 changed files with 2 additions and 2 deletions
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4
qom/object.c
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@ -417,7 +417,7 @@ void object_delete(Object *obj)
Object *object_dynamic_cast(Object *obj, const char *typename) Object *object_dynamic_cast(Object *obj, const char *typename)
{ {
if (object_class_dynamic_cast(object_get_class(obj), typename)) { if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
return obj; return obj;
} }
@ -430,7 +430,7 @@ Object *object_dynamic_cast_assert(Object *obj, const char *typename)
inst = object_dynamic_cast(obj, typename); inst = object_dynamic_cast(obj, typename);
if (!inst) { if (!inst && obj) {
fprintf(stderr, "Object %p is not an instance of type %s\n", fprintf(stderr, "Object %p is not an instance of type %s\n",
obj, typename); obj, typename);
abort(); abort();