diff options
authorTaehee Yoo <>2020-02-27 12:25:19 +0000
committerDavid S. Miller <>2020-02-27 11:45:07 -0800
commit1dc49e9d164cd7e11c81279c83db84a147e14740 (patch)
parentc026d970102e9af9958edefb4a015702c6aab636 (diff)
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: modprobe rmnet 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 <> Signed-off-by: David S. Miller <>
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
index 0ad64aa66592..3c0e6d24d083 100644
--- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
+++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c
@@ -306,6 +306,10 @@ 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;