RDS: Do not send a pong to an incoming ping with 0 src port
RDS ping messages are sent with a non-zero src port to a zero dst port, so that the rds pong messages can be sent back to the originators src port. However if a confused/malicious sender sends a ping with a 0 src port, we'd have an infinite ping-pong loop. To avoid this, the receiver should ignore ping messages with a 0 src port. Acked-by: NSantosh Shilimkar <santosh.shilimkar@oracle.com> Signed-off-by: NSowmini Varadhan <sowmini.varadhan@oracle.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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