parport: Fix mem leak in parport_register_dev_model

[ Upstream commit 1c7ebeab ]

BUG: memory leak
unreferenced object 0xffff8881df48cda0 (size 16):
  comm "syz-executor.0", pid 5077, jiffies 4295994670 (age 22.280s)
  hex dump (first 16 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000d2d0d5fe>] parport_register_dev_model+0x141/0x6e0 [parport]
    [<00000000782f6dab>] 0xffffffffc15d1196
    [<00000000d2ca6ae4>] platform_drv_probe+0x7e/0x100
    [<00000000628c2a94>] really_probe+0x342/0x4d0
    [<000000006874f5da>] driver_probe_device+0x8c/0x170
    [<00000000424de37a>] __device_attach_driver+0xda/0x100
    [<000000002acab09a>] bus_for_each_drv+0xfe/0x170
    [<000000003d9e5f31>] __device_attach+0x190/0x230
    [<0000000035d32f80>] bus_probe_device+0x123/0x140
    [<00000000a05ba627>] device_add+0x7cc/0xce0
    [<000000003f7560bf>] platform_device_add+0x230/0x3c0
    [<000000002a0be07d>] 0xffffffffc15d0949
    [<000000007361d8d2>] port_check+0x3b/0x50 [parport]
    [<000000004d67200f>] bus_for_each_dev+0x115/0x180
    [<000000003ccfd11c>] __parport_register_driver+0x1f0/0x210 [parport]
    [<00000000987f06fc>] 0xffffffffc15d803e

After commit 4e5a74f1 ("parport: Revert "parport: fix
memory leak""), free_pardevice do not free par_dev->state,
we should free it in error path of parport_register_dev_model
before return.
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 4e5a74f1 ("parport: Revert "parport: fix memory leak"")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/parport/share.c

@@ -895,6 +895,7 @@ parport_register_dev_model(struct parport *port, const char *name,
 	par_dev->devmodel = true;
 	ret = device_register(&par_dev->dev);
 	if (ret) {
+		kfree(par_dev->state);
 		put_device(&par_dev->dev);
 		goto err_put_port;
 	}
@@ -912,6 +913,7 @@ parport_register_dev_model(struct parport *port, const char *name,
 			spin_unlock(&port->physport->pardevice_lock);
 			pr_debug("%s: cannot grant exclusive access for device %s\n",
 				 port->name, name);
+			kfree(par_dev->state);
 			device_unregister(&par_dev->dev);
 			goto err_put_port;
 		}