[PATCH] ALSA: jack: Check the return value of kstrdup()

[Joe Perches]

On Sun, 2021-12-12 at 01:13 +0800, xkernel wrote:
> kstrdup() can return NULL, it is better to check the return value of it.
[]
> diff --git a/sound/core/jack.c b/sound/core/jack.c
[]
> @@ -509,6 +509,8 @@ int snd_jack_new(struct snd_card *card, const char *id, int type,
>  		return -ENOMEM;
>  
>  	jack->id = kstrdup(id, GFP_KERNEL);
> +	if (jack->id == NULL)
> +		return -ENOMEM;

jack should be freed too.

	if (!jack->id) {
		kfree(jack);
		return -ENOMEM;
	}

>  
>  	/* don't creat input device for phantom jack */
>  	if (!phantom_jack) {