From: Sven Eckelmann <sven.eckelmann@gmx.de>
Date: Sat, 18 Sep 2010 19:01:20 +0000 (+0200)
Subject: Staging: batman-adv: count batman_if list queries as reference
X-Git-Tag: v2.6.37-rc1~60^2~3^2~545
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=399fb5b445370ddcc93221e339d02736f55b9bb8;p=pandora-kernel.git

Staging: batman-adv: count batman_if list queries as reference

The return of get_batman_if_by_netdev and get_active_batman_if leaks a
pointer from the rcu protected list of interfaces. We must protect it to
prevent a too early release of the memory. Those functions must increase
the reference counter before rcu_read_unlock or it may be to late to
prevent a free.

hardif_add_interface must also increase the reference count for the
returned batman_if to make the behaviour consistent.

Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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