From 11bb62f7c05240a933dd2e6b3bf3871d99464524 Mon Sep 17 00:00:00 2001 From: Sowmini Varadhan Date: Thu, 30 Jun 2016 16:11:18 -0700 Subject: [PATCH] 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: Santosh Shilimkar Signed-off-by: Sowmini Varadhan Signed-off-by: David S. Miller --- net/rds/recv.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/rds/recv.c b/net/rds/recv.c index b58f50571782..fed53a6c2890 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -226,6 +226,10 @@ void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, cp->cp_next_rx_seq = be64_to_cpu(inc->i_hdr.h_sequence) + 1; if (rds_sysctl_ping_enable && inc->i_hdr.h_dport == 0) { + if (inc->i_hdr.h_sport == 0) { + rdsdebug("ignore ping with 0 sport from 0x%x\n", saddr); + goto out; + } rds_stats_inc(s_recv_ping); rds_send_pong(cp, inc->i_hdr.h_sport); goto out; -- 2.20.1