linux-kernel - [70/89] netns: Fail conspicously if someone uses net

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Date:	Wed, 01 Feb 2012 13:00:34 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Sasha Levin <levinsasha928@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [70/89] netns: Fail conspicously if someone uses net_generic at an inappropriate time.

3.2-stable review patch.  If anyone has any objections, please let me know.

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

From: "Eric W. Biederman" <ebiederm@...ssion.com>

[ Upstream commit 5ee4433efe99b9f39f6eff5052a177bbcfe72cea ]

By definition net_generic should never be called when it can return
NULL.  Fail conspicously with a BUG_ON to make it clear when people mess
up that a NULL return should never happen.

Recently there was a bug in the CAIF subsystem where it was registered
with register_pernet_device instead of register_pernet_subsys.  It was
erroneously concluded that net_generic could validly return NULL and
that net_assign_generic was buggy (when it was just inefficient).
Hopefully this BUG_ON will prevent people to coming to similar erroneous
conclusions in the futrue.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Tested-by: Sasha Levin <levinsasha928@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/net/netns/generic.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/net/netns/generic.h
+++ b/include/net/netns/generic.h
@@ -41,6 +41,7 @@ static inline void *net_generic(const st
 	ptr = ng->ptr[id - 1];
 	rcu_read_unlock();

+	BUG_ON(!ptr);
 	return ptr;
 }
 #endif

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