[PATCH v2 15/29] hw/core/qdev-properties-system: Fix missing ERRP_GUARD() for error_prepend()

[Zhao Liu]

From: Zhao Liu <zhao1.liu@intel.com>

As the comment in qapi/error, passing @errp to error_prepend() requires
ERRP_GUARD():

* = Why, when and how to use ERRP_GUARD() =
*
* Without ERRP_GUARD(), use of the @errp parameter is restricted:
...
* - It should not be passed to error_prepend(), error_vprepend() or
*   error_append_hint(), because that doesn't work with &error_fatal.
* ERRP_GUARD() lifts these restrictions.
*
* To use ERRP_GUARD(), add it right at the beginning of the function.
* @errp can then be used without worrying about the argument being
* NULL or &error_fatal.

ERRP_GUARD() could avoid the case when @errp is &error_fatal, the user
can't see this additional information, because exit() happens in
error_setg earlier than information is added [1].

The set_chr() passes @errp to error_prepend() without ERRP_GUARD().

As a PropertyInfo.set method, there are too many possible callers to
check the impact of this defect; it may or may not be harmless. Thus it
is necessary to protect @errp with ERRP_GUARD().

To avoid the issue like [1] said, add missing ERRP_GUARD() at the
beginning of this function.

[1]: Issue description in the commit message of commit ae7c80a7bd73
     ("error: New macro ERRP_GUARD()").

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com
Cc: Eduardo Habkost <eduardo@habkost.net>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
---
v2: Use Markus' sentence to polish commit message. (Markus)
---
 hw/core/qdev-properties-system.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index b45e90edb2a2..00c968f4f52b 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -242,6 +242,7 @@ static void get_chr(Object *obj, Visitor *v, const char 
*name, void *opaque,
 static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
                     Error **errp)
 {
+    ERRP_GUARD();
     Property *prop = opaque;
     CharBackend *be = object_field_prop_ptr(obj, prop);
     Chardev *s;
-- 
2.34.1