linux-kernel - Re: [PATCH] ALSA: control led: fix memory leak in snd_ctl_led

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Date:   Fri, 28 May 2021 17:05:00 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Dongliang Mu <mudongliangabcd@...il.com>
Cc:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        syzbot+08a7d8b51ea048a74ffb@...kaller.appspotmail.com
Subject: Re: [PATCH] ALSA: control led: fix memory leak in
 snd_ctl_led_register

On Fri, May 28, 2021 at 09:50:49PM +0800, Dongliang Mu wrote:
>
> Can you please give some advise on how to fix this WARN issue?

But it feels like it spoils the fun if I write the commit...  Anyway:

regards,
dan carpenter

diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index 25f57c14f294..dd357abc1b58 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -740,6 +740,7 @@ static int __init snd_ctl_led_init(void)
 			for (; group > 0; group--) {
 				led = &snd_ctl_leds[group - 1];
 				device_del(&led->dev);
+				device_put(&led->dev);
 			}
 			device_del(&snd_ctl_led_dev);
 			return -ENOMEM;
@@ -768,6 +769,7 @@ static void __exit snd_ctl_led_exit(void)
 	for (group = 0; group < MAX_LED; group++) {
 		led = &snd_ctl_leds[group];
 		device_del(&led->dev);
+		device_put(&led->dev);
 	}
 	device_del(&snd_ctl_led_dev);
 	snd_ctl_led_clean(NULL);