From e5b50ada76f44c8742a123813689bff4db062a5a Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 8 Oct 2014 12:08:38 +0200
Subject: [PATCH] ALSA: Allow pass NULL dev for snd_pci_quirk_lookup()
Add a NULL check in snd_pci_quirk_lookup() so that NULL can be passed
as a pci_dev pointer. This fixes the possible NULL dereferences in
HD-audio drivers.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/misc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/sound/core/misc.c b/sound/core/misc.c
index 30e027ecf4da..f2e8226c88fb 100644
--- a/sound/core/misc.c
+++ b/sound/core/misc.c
@@ -145,6 +145,8 @@ EXPORT_SYMBOL(snd_pci_quirk_lookup_id);
const struct snd_pci_quirk *
snd_pci_quirk_lookup(struct pci_dev *pci, const struct snd_pci_quirk *list)
{
+ if (!pci)
+ return NULL;
return snd_pci_quirk_lookup_id(pci->subsystem_vendor,
pci->subsystem_device,
list);