* [PATCH] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path
@ 2021-05-09 8:28 Christophe JAILLET
2021-05-13 14:19 ` Greg KH
0 siblings, 1 reply; 2+ messages in thread
From: Christophe JAILLET @ 2021-05-09 8:28 UTC (permalink / raw)
To: gregkh, hjk, jirislaby, lee.jones
Cc: linux-serial, linux-kernel, kernel-janitors, Christophe JAILLET
In the probe function, if the final 'serial_config()' fails, 'info' is
leaking.
Use 'devm_kzalloc' instead to fix the leak and simplify the .remove
function.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
I've not been able to find a Fixes tag. All I know is that it is old!
---
drivers/tty/serial/8250/serial_cs.c | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c
index 63ea9c4da3d5..d18c98e0d0b0 100644
--- a/drivers/tty/serial/8250/serial_cs.c
+++ b/drivers/tty/serial/8250/serial_cs.c
@@ -310,7 +310,7 @@ static int serial_probe(struct pcmcia_device *link)
dev_dbg(&link->dev, "serial_attach()\n");
/* Create new serial device */
- info = kzalloc(sizeof(*info), GFP_KERNEL);
+ info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->p_dev = link;
@@ -325,17 +325,12 @@ static int serial_probe(struct pcmcia_device *link)
static void serial_detach(struct pcmcia_device *link)
{
- struct serial_info *info = link->priv;
-
dev_dbg(&link->dev, "serial_detach\n");
/*
* Ensure that the ports have been released.
*/
serial_remove(link);
-
- /* free bits */
- kfree(info);
}
/*====================================================================*/
--
2.30.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path
2021-05-09 8:28 [PATCH] tty: serial: 8250: serial_cs: Fix a memory leak in error handling path Christophe JAILLET
@ 2021-05-13 14:19 ` Greg KH
0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2021-05-13 14:19 UTC (permalink / raw)
To: Christophe JAILLET
Cc: hjk, jirislaby, lee.jones, linux-serial, linux-kernel, kernel-janitors
On Sun, May 09, 2021 at 10:28:18AM +0200, Christophe JAILLET wrote:
> In the probe function, if the final 'serial_config()' fails, 'info' is
> leaking.
>
> Use 'devm_kzalloc' instead to fix the leak and simplify the .remove
> function.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> I've not been able to find a Fixes tag. All I know is that it is old!
> ---
> drivers/tty/serial/8250/serial_cs.c | 7 +------
> 1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/serial_cs.c b/drivers/tty/serial/8250/serial_cs.c
> index 63ea9c4da3d5..d18c98e0d0b0 100644
> --- a/drivers/tty/serial/8250/serial_cs.c
> +++ b/drivers/tty/serial/8250/serial_cs.c
> @@ -310,7 +310,7 @@ static int serial_probe(struct pcmcia_device *link)
> dev_dbg(&link->dev, "serial_attach()\n");
>
> /* Create new serial device */
> - info = kzalloc(sizeof(*info), GFP_KERNEL);
> + info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
Ick, let's not mix and only use some devm_ calls here, why not just fix
it up and free it in the error path?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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