serial: sunsab: Fix error handling in sunsab_init()

[ Upstream commit 1a6ec673fb627c26e2267ca0a03849f91dbd9b40 ]

The sunsab_init() returns the platform_driver_register() directly without
checking its return value, if platform_driver_register() failed, the
allocated sunsab_ports is leaked.
Fix by free sunsab_ports and set it to NULL when platform_driver_register()
failed.

Fixes: c4d37215a824 ("[SERIAL] sunsab: Convert to of_driver framework.")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221123061212.52593-1-yuancan@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 99608b2..7ace3aa 100644 (file)
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -1133,7 +1133,13 @@ static int __init sunsab_init(void)
                }
        }
 
-       return platform_driver_register(&sab_driver);
+       err = platform_driver_register(&sab_driver);
+       if (err) {
+               kfree(sunsab_ports);
+               sunsab_ports = NULL;
+       }
+
+       return err;
 }
 
 static void __exit sunsab_exit(void)