linux-kernel - [PATCH 6/6] kdbus: fix NULL-deref in activator cleanup

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Date:	Thu,  2 Jul 2015 10:28:34 +0200
From:	David Herrmann <dh.herrmann@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, daniel@...que.org,
	tixxdz@...ndz.org, David Herrmann <dh.herrmann@...il.com>
Subject: [PATCH 6/6] kdbus: fix NULL-deref in activator cleanup

Right now, we always assume an activator has a valid name and
conn->activator_of is set. However, this assumption is not true if the
setup of the activator fails. In those cases, the ->flags field indicates
an activator, but the name might not have been claimed, yet.

Fix the destructor of connections to not assume all activators have
claimed names.

Signed-off-by: David Herrmann <dh.herrmann@...il.com>
---
 ipc/kdbus/names.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ipc/kdbus/names.c b/ipc/kdbus/names.c
index d77ee08..057f806 100644
--- a/ipc/kdbus/names.c
+++ b/ipc/kdbus/names.c
@@ -444,7 +444,7 @@ void kdbus_name_release_all(struct kdbus_name_registry *reg,
 
 	down_write(&reg->rwlock);
 
-	if (kdbus_conn_is_activator(conn)) {
+	if (conn->activator_of) {
 		activator = conn->activator_of->activator;
 		conn->activator_of->activator = NULL;
 	}
-- 
2.4.5

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