From: Zhao Liu <[email protected]>
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 <[email protected]>
Cc: Jagannathan Raman <[email protected]>
Signed-off-by: Zhao Liu <[email protected]>
---
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
