linux-kernel - [PATCH] net/net_namespace: Check the return value of register_pernet

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Message-Id: <20181224014239.11601-1-pakki001@umn.edu>
Date:   Sun, 23 Dec 2018 19:42:38 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, "David S. Miller" <davem@...emloft.net>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Andrei Vagin <avagin@...tuozzo.com>,
        Tyler Hicks <tyhicks@...onical.com>,
        Matthew Wilcox <willy@...radead.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] net/net_namespace: Check the return value of register_pernet_subsys()

In net_ns_init(), register_pernet_subsys() could fail while registering
network namespace subsystems. The fix checks the return value and
sends a panic() on failure.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 net/core/net_namespace.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index fefe72774aeb..af8849a7a9c3 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -917,7 +917,8 @@ static int __init net_ns_init(void)
 	init_net_initialized = true;
 	up_write(&pernet_ops_rwsem);
 
-	register_pernet_subsys(&net_ns_ops);
+	if (register_pernet_subsys(&net_ns_ops))
+		panic("Could not register network namespace subsystems");
 
 	rtnl_register(PF_UNSPEC, RTM_NEWNSID, rtnl_net_newid, NULL,
 		      RTNL_FLAG_DOIT_UNLOCKED);
-- 
2.17.1