@@ -1064,7 +1064,6 @@ static void mscc_ocelot_release_ports(struct ocelot *ocelot)
int port;
for (port = 0; port < ocelot->num_phys_ports; port++) {
- struct ocelot_port_private *priv;
struct ocelot_port *ocelot_port;
ocelot_port = ocelot->ports[port];
@@ -1072,12 +1071,7 @@ static void mscc_ocelot_release_ports(struct ocelot *ocelot)
continue;
ocelot_deinit_port(ocelot, port);
-
- priv = container_of(ocelot_port, struct ocelot_port_private,
- port);
-
- unregister_netdev(priv->dev);
- free_netdev(priv->dev);
+ ocelot_release_port(ocelot_port);
}
}
@@ -1123,14 +1117,22 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev,
continue;
port = reg;
+ if (port < 0 || port >= ocelot->num_phys_ports) {
+ dev_err(ocelot->dev,
+ "invalid port number: %d >= %d\n", port,
+ ocelot->num_phys_ports);
+ continue;
+ }
snprintf(res_name, sizeof(res_name), "port%d", port);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
res_name);
target = ocelot_regmap_init(ocelot, res);
- if (IS_ERR(target))
- continue;
+ if (IS_ERR(target)) {
+ err = PTR_ERR(target);
+ goto out_teardown;
+ }
phy_node = of_parse_phandle(portnp, "phy-handle", 0);
if (!phy_node)
@@ -1147,6 +1149,7 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev,
of_node_put(portnp);
goto out_teardown;
}
+ registered_ports[port] = true;
err = ocelot_probe_port(ocelot, port, target, phy);
if (err) {
@@ -1154,8 +1157,6 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev,
goto out_teardown;
}
- registered_ports[port] = true;
-
ocelot_port = ocelot->ports[port];
priv = container_of(ocelot_port, struct ocelot_port_private,
port);
@@ -1213,15 +1214,9 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev,
err = ocelot_port_devlink_init(ocelot, port,
DEVLINK_PORT_FLAVOUR_UNUSED);
- if (err) {
- while (port-- >= 0) {
- if (!registered_ports[port])
- continue;
- ocelot_port_devlink_teardown(ocelot, port);
- }
-
+ if (err)
goto out_teardown;
- }
+ registered_ports[port] = true;
}
kfree(registered_ports);
@@ -1233,10 +1228,8 @@ static int mscc_ocelot_init_ports(struct platform_device *pdev,
mscc_ocelot_release_ports(ocelot);
/* Tear down devlink ports for the registered network interfaces */
for (port = 0; port < ocelot->num_phys_ports; port++) {
- if (!registered_ports[port])
- continue;
-
- ocelot_port_devlink_teardown(ocelot, port);
+ if (registered_ports[port])
+ ocelot_port_devlink_teardown(ocelot, port);
}
kfree(registered_ports);
return err;
There are several error handling bugs in mscc_ocelot_init_ports(). I went through the code, and carefully audited it and made fixes and cleanups. 1) The ocelot_probe_port() function didn't have a mirror release function so it was hard to follow. I created the ocelot_release_port() function. 2) In the ocelot_probe_port() function, if the register_netdev() call failed, then it lead to a double free_netdev(dev) bug. Fix this by moving the "ocelot->ports[port] = ocelot_port;" assignment to the end of the function after everything has succeeded. 3) I was concerned that the "port" which comes from of_property_read_u32() might be out of bounds so I added a check for that. 4) In the original code if ocelot_regmap_init() failed then the driver tried to continue but I think that should be a fatal error. 5) If ocelot_probe_port() failed then the most recent devlink was leaked. Fix this by moving the "registered_ports[port] = true;" assignment earlier. 6) The error handling if the final ocelot_port_devlink_init() failed had two problems. The "while (port-- >= 0)" loop should have been "--port" pre-op instead of a post-op to avoid a buffer underflow. The "if (!registered_ports[port])" condition was reversed leading to resource leaks and double frees. Fixes: 6c30384eb1de ("net: mscc: ocelot: register devlink ports") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> --- drivers/net/ethernet/mscc/ocelot_vsc7514.c | 39 +++++++++------------- 1 file changed, 16 insertions(+), 23 deletions(-)