* [PATCH] input: psmouse: Add unlock mutex before to exit psmouse_attr_set_protocol
@ 2024-10-01 11:08 Alessandro Zanni
2024-10-01 13:09 ` Dmitry Torokhov
0 siblings, 1 reply; 2+ messages in thread
From: Alessandro Zanni @ 2024-10-01 11:08 UTC (permalink / raw)
To: dmitry.torokhov, erick.archer, zhoubinbin, jay_lee, jon_xie
Cc: Alessandro Zanni, linux-input, linux-kernel, skhan, anupnewsmail
In error handling code for "no such device" or memory already used,
release the mutex before to return.
Found with Coccinelle static analisys tool,
script: https://coccinelle.gitlabpages.inria.fr/website/rules/mut.cocci
Signed-off-by: Alessandro Zanni <alessandro.zanni87@gmail.com>
---
drivers/input/mouse/psmouse-base.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index 5a4defe9cf32..cb3a125d8d7c 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -1930,11 +1930,13 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
if (serio->drv != &psmouse_drv) {
input_free_device(new_dev);
+ mutex_unlock(&psmouse_mutex);
return -ENODEV;
}
if (psmouse->protocol == proto) {
input_free_device(new_dev);
+ mutex_unlock(&psmouse_mutex);
return count; /* switched by other thread */
}
}
--
2.43.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] input: psmouse: Add unlock mutex before to exit psmouse_attr_set_protocol
2024-10-01 11:08 [PATCH] input: psmouse: Add unlock mutex before to exit psmouse_attr_set_protocol Alessandro Zanni
@ 2024-10-01 13:09 ` Dmitry Torokhov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Torokhov @ 2024-10-01 13:09 UTC (permalink / raw)
To: Alessandro Zanni
Cc: erick.archer, zhoubinbin, jay_lee, jon_xie, linux-input,
linux-kernel, skhan, anupnewsmail
Hi Alessandro,
On Tue, Oct 01, 2024 at 01:08:38PM +0200, Alessandro Zanni wrote:
> In error handling code for "no such device" or memory already used,
> release the mutex before to return.
>
> Found with Coccinelle static analisys tool,
> script: https://coccinelle.gitlabpages.inria.fr/website/rules/mut.cocci
>
> Signed-off-by: Alessandro Zanni <alessandro.zanni87@gmail.com>
> ---
> drivers/input/mouse/psmouse-base.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
> index 5a4defe9cf32..cb3a125d8d7c 100644
> --- a/drivers/input/mouse/psmouse-base.c
> +++ b/drivers/input/mouse/psmouse-base.c
> @@ -1930,11 +1930,13 @@ static ssize_t psmouse_attr_set_protocol(struct psmouse *psmouse, void *data, co
>
> if (serio->drv != &psmouse_drv) {
> input_free_device(new_dev);
> + mutex_unlock(&psmouse_mutex);
I am sorry, bit this makes absolutely no sense. This mutex is taken
(and then released) in psmouse_attr_set_helper() wrapper.
psmouse_attr_set_protocol() momentarily drops and then reacquires it,
but it should not release it either failure or success parts.
Thanks.
--
Dmitry
^ permalink raw reply [flat|nested] 2+ messages in thread
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2024-10-01 11:08 [PATCH] input: psmouse: Add unlock mutex before to exit psmouse_attr_set_protocol Alessandro Zanni
2024-10-01 13:09 ` Dmitry Torokhov
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