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From: Alexey Khoroshilov <khoroshilov@ispras.ru>
To: Eric Dumazet <edumazet@google.com>, Greg Kurz <gkurz@linux.vnet.ibm.com>,
        "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alexey Khoroshilov <khoroshilov@ispras.ru>,
        David Gibson <david@gibson.dropbear.id.au>,
        "David S. Miller" <davem@davemloft.net>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, ldv-project@linuxtesting.org
Subject: Suspicious code in tun_flow_update()
Date: Sat,  5 Mar 2016 02:04:44 +0300
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Hello,

If tun_flow_find() successfully finds tun_flow_entry,
tun_flow_update() updates the entry in place.

Is such usage of RCU safe here?

Found by Linux Driver Verification project (linuxtesting.org).

--
Alexey Khoroshilov
Linux Verification Center, ISPRAS