[PATCH 4.9 10/19] ALSA: jack: Check the return value of kstrdup()

[Greg Kroah-Hartman]

From: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>

commit c01c1db1dc632edafb0dff32d40daf4f9c1a4e19 upstream.

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

Signed-off-by: Xiaoke Wang <xkernel.wang@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/tencent_094816F3522E0DC704056C789352EBBF0606@xxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 sound/core/jack.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/sound/core/jack.c
+++ b/sound/core/jack.c
@@ -234,6 +234,10 @@ int snd_jack_new(struct snd_card *card,
 		return -ENOMEM;
 
 	jack->id = kstrdup(id, GFP_KERNEL);
+	if (jack->id == NULL) {
+		kfree(jack);
+		return -ENOMEM;
+	}
 
 	/* don't creat input device for phantom jack */
 	if (!phantom_jack) {