tree a78ad1dda2185586b54526f0f67eca87d5ca01f5
parent dabbf0e824fac8e98ca942e0962c7764924edeaa
author Taehee Yoo <ap420073@gmail.com> 1584082214 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1585840831 +0200

hsr: use rcu_read_lock() in hsr_get_node_{list/status}()

[ Upstream commit 173756b86803655d70af7732079b3aa935e6ab68 ]

hsr_get_node_{list/status}() are not under rtnl_lock() because
they are callback functions of generic netlink.
But they use __dev_get_by_index() without rtnl_lock().
So, it would use unsafe data.
In order to fix it, rcu_read_lock() and dev_get_by_index_rcu()
are used instead of __dev_get_by_index().

Fixes: f421436a591d ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>