linux-kernel - [PATCH 3.4 124/214] ALSA: hda - Fix oops caused by recent commit "Fix internal mic for Lenovo Ideapad U300s"

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Message-Id: <20140605041656.372911597@linuxfoundation.org>
Date:	Wed,  4 Jun 2014 21:18:07 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
	David Henningsson <david.henningsson@...onical.com>,
	Takashi Iwai <tiwai@...e.de>,
	Ben Hutchings <ben@...adent.org.uk>,
	Weng Meiling <wengmeiling.weng@...wei.com>
Subject: [PATCH 3.4 124/214] ALSA: hda - Fix oops caused by recent commit "Fix internal mic for Lenovo Ideapad U300s"

3.4-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>
Cc: Weng Meiling <wengmeiling.weng@...wei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/hda/patch_conexant.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -4430,7 +4430,9 @@ static void apply_fixup(struct hda_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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