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

[xkernel]

kstrdup() can return NULL, it is better to check the return value of it.

Signed-off-by: xkernel <xkernel.wang at foxmail.com>
---
 sound/core/jack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/jack.c b/sound/core/jack.c
index 32350c6..5fd9954 100644
--- 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;
 
 	/* don't creat input device for phantom jack */
 	if (!phantom_jack) {
--