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netns: Fail conspicously if someone uses net_generic at an inappropriate time.

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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@xmission.com>
Tested-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2012-01-26 14:02:55 +00:00 committed by David S. Miller
parent cc0d7b91db
commit 5ee4433efe
1 changed files with 1 additions and 0 deletions
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include/net/netns/generic.h
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@ -41,6 +41,7 @@ static inline void *net_generic(const struct net *net, int id)
ptr = ng->ptr[id - 1];
rcu_read_unlock();
BUG_ON(!ptr);
return ptr;
}
#endif