[PATCH] ALSA: ice1712: check pro S/PDIF control allocations

[Ruoyu Wang <ruoyuw560@gmail.com>]

snd_ice1712_spdif_build_controls() creates pro S/PDIF controls and then
sets kctl->id.device before calling snd_ctl_add(). snd_ctl_new1() can
return NULL on allocation failure, making the device-id write a NULL
pointer dereference.

Check each control allocation before using the returned pointer.

Signed-off-by: Ruoyu Wang <ruoyuw560@gmail.com>
---
 sound/pci/ice1712/ice1712.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/pci/ice1712/ice1712.c b/sound/pci/ice1712/ice1712.c
index 1e39b985bef26..4cec56769c0f6 100644
--- a/sound/pci/ice1712/ice1712.c
+++ b/sound/pci/ice1712/ice1712.c
@@ -2346,21 +2346,29 @@ int snd_ice1712_spdif_build_controls(struct snd_ice1712 *ice)
 	if (snd_BUG_ON(!ice->pcm_pro))
 		return -EIO;
 	kctl = snd_ctl_new1(&snd_ice1712_spdif_default, ice);
+	if (!kctl)
+		return -ENOMEM;
 	kctl->id.device = ice->pcm_pro->device;
 	err = snd_ctl_add(ice->card, kctl);
 	if (err < 0)
 		return err;
 	kctl = snd_ctl_new1(&snd_ice1712_spdif_maskc, ice);
+	if (!kctl)
+		return -ENOMEM;
 	kctl->id.device = ice->pcm_pro->device;
 	err = snd_ctl_add(ice->card, kctl);
 	if (err < 0)
 		return err;
 	kctl = snd_ctl_new1(&snd_ice1712_spdif_maskp, ice);
+	if (!kctl)
+		return -ENOMEM;
 	kctl->id.device = ice->pcm_pro->device;
 	err = snd_ctl_add(ice->card, kctl);
 	if (err < 0)
 		return err;
 	kctl = snd_ctl_new1(&snd_ice1712_spdif_stream, ice);
+	if (!kctl)
+		return -ENOMEM;
 	kctl->id.device = ice->pcm_pro->device;
 	err = snd_ctl_add(ice->card, kctl);
 	if (err < 0)
-- 
2.34.1