Subject: [PATCH AUTOSEL 4.14 082/127] net/net_namespace: Check the return value of register_pernet_subsys()

From: Sasha Levin <[email-masked]>
Date: Fri, 22 Nov 2019 00:55:00 -0500

From: Aditya Pakki <[email-masked]>

[ Upstream commit 0eb987c874dc93f9c9d85a6465dbde20fdd3884c ]

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 <[email-masked]>
Reviewed-by: Kirill Tkhai <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 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 60b88718b1d48..1af25d53f63ca 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -854,7 +854,8 @@ static int __init net_ns_init(void)
 
 	mutex_unlock(&net_mutex);
 
-	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);
-- 
2.20.1