dpif-netdev: Initialize packet RSS hash in dpif_netdev_execute().
The datapath code expects the RSS hash to always be initialized. This
is enforced by checking in emc_processing() that the hash is valid, and
eventually by computing a new one.
Unfortunately, there is another entry point to the datapath,
dpif_netdev_execute(). A packet generated by OVS (BFD frame,
packet-out from controller) doesn't have a valid RSS hash and so is
allowed to enter the datapath with an uninitialized hash value.
This commit recomputes the hash (if not valid) in dpif_netdev_execute().
The only place where we would use an invalid hash is netdev-vport, in
push_udp_header(). This caused an uninitialized memory read, and a
random value to be assigned to the outer tunnel header source port.
Reported-by: William Tu <u9012063@gmail.com> Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com> Acked-by: William Tu <u9012063@gmail.com> Acked-by: Ben Pfaff <blp@ovn.org>