netdev - [PATCH net 07/10] net: rmnet: do not allow to change mux id if mux id is duplicated

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Message-Id: <20200226174814.5965-1-ap420073@gmail.com>
Date:   Wed, 26 Feb 2020 17:48:14 +0000
From:   Taehee Yoo <ap420073@...il.com>
To:     davem@...emloft.net, kuba@...nel.org, subashab@...eaurora.org,
        stranche@...eaurora.org, netdev@...r.kernel.org
Cc:     ap420073@...il.com
Subject: [PATCH net 07/10] net: rmnet: do not allow to change mux id if mux id is duplicated

Basically, duplicate mux id isn't be allowed.
So, the creation of rmnet will be failed if there is duplicate mux id
is existing.
But, changelink routine doesn't check duplicate mux id.

Test commands:
    ip link add dummy0 type dummy
    ip link add rmnet0 link dummy0 type rmnet mux_id 1
    ip link add rmnet1 link dummy0 type rmnet mux_id 2
    ip link set rmnet1 type rmnet mux_id 1

Fixes: 23790ef12082 ("net: qualcomm: rmnet: Allow to configure flags for existing devices")
Signed-off-by: Taehee Yoo <ap420073@...il.com>
---
 drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
index 93745cd45c29..bdb88472a0a0 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
@@ -309,6 +309,10 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[],
 
 	if (data[IFLA_RMNET_MUX_ID]) {
 		mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]);
+		if (rmnet_get_endpoint(port, mux_id)) {
+			NL_SET_ERR_MSG_MOD(extack, "MUX ID already exists");
+			return -EINVAL;
+		}
 		ep = rmnet_get_endpoint(port, priv->mux_id);
 		if (!ep)
 			return -ENODEV;
-- 
2.17.1