linux-kernel - [ 006/105] ALSA: hda - Fix oops caused by recent commit "Fix internal mic for Lenovo Ideapad U300s"

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Date:	Sun, 28 Oct 2012 23:15:42 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	David Henningsson <david.henningsson@...onical.com>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Takashi Iwai <tiwai@...e.de>
Subject: [ 006/105] ALSA: hda - Fix oops caused by recent commit "Fix internal mic for
 Lenovo Ideapad U300s"

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Henningsson <david.henningsson@...onical.com>

commit 83b0c6ba999643ee8ad6329f26e1cdc870e1a920 upstream.

Make sure we don't dereference the "quirk" pointer when it is null.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David Henningsson <david.henningsson@...onical.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/pci/hda/patch_conexant.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index cbe115b..abb59f4 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -4441,7 +4441,9 @@ static void apply_fixup(struct hda_codec *codec,
 	struct conexant_spec *spec = codec->spec;
 
 	quirk = snd_pci_quirk_lookup(codec->bus->pci, quirk);
-	if (quirk && table[quirk->value]) {
+	if (!quirk)
+		return;
+	if (table[quirk->value]) {
 		snd_printdd(KERN_INFO "hda_codec: applying pincfg for %s\n",
 			    quirk->name);
 		apply_pincfg(codec, table[quirk->value]);


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