tty: serial: 8250: serial_cs: Fix a memory leak in error handling path

[ Upstream commit fad92b11047a748c996ebd6cfb164a63814eeb2e ]

In the probe function, if the final 'serial_config()' fails, 'info' is
leaking.

Add a resource handling path to free this memory.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/dc25f96b7faebf42e60fe8d02963c941cf4d8124.1621971720.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c
index ccd1a615305b5bc9eecabe8ccb9f144e23320988..a05c2b652040cb9b690ce435b9afbee18b75d619 100644 (file)
--- a/drivers/tty/serial/8250/serial_cs.c
+++ b/drivers/tty/serial/8250/serial_cs.c
@@ -306,6 +306,7 @@ static int serial_resume(struct pcmcia_device *link)
 static int serial_probe(struct pcmcia_device *link)
 {
        struct serial_info *info;
+       int ret;
 
        dev_dbg(&link->dev, "serial_attach()\n");
 
@@ -320,7 +321,15 @@ static int serial_probe(struct pcmcia_device *link)
        if (do_sound)
                link->config_flags |= CONF_ENABLE_SPKR;
 
-       return serial_config(link);
+       ret = serial_config(link);
+       if (ret)
+               goto free_info;
+
+       return 0;
+
+free_info:
+       kfree(info);
+       return ret;
 }
 
 static void serial_detach(struct pcmcia_device *link)