[PATCH 03/17] hw/remote/remote-obj: hw/misc/ivshmem: Fix missing ERRP_GUARD() for error_prepend()

[Zhao Liu <zhao1.liu@linux.intel.com>]

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 the pointer of
error_fatal, the user can't see this additional information, because
exit() happens in error_setg earlier than information is added [1].

The remote_object_set_fd() passes @errp to error_prepend(), and as a
PropertyInfo.set method, its @errp is so widely sourced that it is
necessary to protect it 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: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Cc: Jagannathan Raman <jag.raman@oracle.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 hw/remote/remote-obj.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/remote/remote-obj.c b/hw/remote/remote-obj.c
index 65b6f7cc863f..dc27cc8da1f3 100644
--- a/hw/remote/remote-obj.c
+++ b/hw/remote/remote-obj.c
@@ -49,6 +49,7 @@ struct RemoteObject {
 
 static void remote_object_set_fd(Object *obj, const char *str, Error **errp)
 {
+    ERRP_GUARD();
     RemoteObject *o = REMOTE_OBJECT(obj);
     int fd = -1;
 
-- 
2.34.1