netdev - [PATCH net] bareudp: Disallow udp port 0.

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Date:   Thu, 30 Jul 2020 22:33:51 +0530
From:   Martin Varghese <martinvarghesenokia@...il.com>
To:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        jbenc@...hat.com, gnault@...hat.com
Cc:     Martin Varghese <martin.varghese@...ia.com>
Subject: [PATCH net] bareudp: Disallow udp port 0.

From: Martin Varghese <martin.varghese@...ia.com>

Kernel does not support udp destination port 0 on wire. Hence
bareudp device with udp destination port 0 must be disallowed.

Fixes: 571912c69f0e ("net: UDP tunnel encapsulation module for tunnelling different protocols like MPLS, IP, NSH etc.")
Signed-off-by: Martin Varghese <martin.varghese@...ia.com>
---
 drivers/net/bareudp.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bareudp.c b/drivers/net/bareudp.c
index 88e7900853db..08b195d32cbe 100644
--- a/drivers/net/bareudp.c
+++ b/drivers/net/bareudp.c
@@ -578,8 +578,13 @@ static int bareudp2info(struct nlattr *data[], struct bareudp_conf *conf,
 		return -EINVAL;
 	}
 
-	if (data[IFLA_BAREUDP_PORT])
+	if (data[IFLA_BAREUDP_PORT]) {
 		conf->port =  nla_get_u16(data[IFLA_BAREUDP_PORT]);
+		if (!conf->port) {
+			NL_SET_ERR_MSG(extack, "udp port 0 not supported");
+			return -EINVAL;
+		}
+	}
 
 	if (data[IFLA_BAREUDP_ETHERTYPE])
 		conf->ethertype =  nla_get_u16(data[IFLA_BAREUDP_ETHERTYPE]);
-- 
2.18.4