linux-kernel - [070/101] kobj_uevent: Ignore if some listeners cannot handle message

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Message-Id: <20111102222746.156076550@clark.kroah.org>
Date:	Wed, 02 Nov 2011 15:26:54 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Milan Broz <mbroz@...hat.com>,
	Kay Sievers <kay.sievers@...y.org>
Subject: [070/101] kobj_uevent: Ignore if some listeners cannot handle message

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Milan Broz <mbroz@...hat.com>

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@...hat.com>
Acked-by: Kay Sievers <kay.sievers@...y.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 lib/kobject_uevent.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -235,7 +235,7 @@ int kobject_uevent_env(struct kobject *k
 			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;


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