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Subject[PATCH 1/2] netns: Fail conspicously if someone uses net_generic at an inappropriate time.
Date

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>
---
include/net/netns/generic.h | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
index 3419bf5..d55f434 100644
--- a/include/net/netns/generic.h
+++ b/include/net/netns/generic.h
@@ -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
--
1.7.2.5


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