kobj_uevent: Ignore if some listeners cannot handle message

commit ebf4127cd677e9781b450e44dfaaa1cc595efcaa upstream.

kobject_uevent() uses a multicast socket and should ignore
if one of listeners cannot handle messages or nobody is
listening at all.

Easily reproducible when a process in system is cloned
with CLONE_NEWNET flag.

(See also http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/5256)

Signed-off-by: Milan Broz <mbroz@redhat.com>
Acked-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 920a3ca6e2590ddc3d64950a729441758d0a5ce5..507b821f4c1699264d27f1a2b790313687511d96 100644 (file)
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -235,7 +235,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
                        retval = netlink_broadcast(uevent_sock, skb, 0, 1,
                                                   GFP_KERNEL);
                        /* ENOBUFS should be handled in userspace */
-                       if (retval == -ENOBUFS)
+                       if (retval == -ENOBUFS || retval == -ESRCH)
                                retval = 0;
                } else
                        retval = -ENOMEM;