linux-kernel - [PATCH 3.12 030/176] ALSA: hda

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Message-Id: <d97bff5a0563b701a9b07b7dd5af5a69d91104b0.1422455352.git.jslaby@suse.cz>
Date:	Wed, 28 Jan 2015 15:27:40 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Takashi Iwai <tiwai@...e.de>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 030/176] ALSA: hda - using uninitialized data

From: Dan Carpenter <dan.carpenter@...cle.com>

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

===============

commit 69eba10e606a80665f8573221fec589430d9d1cb upstream.

In olden times the snd_hda_param_read() function always set "*start_id"
but in 2007 we introduced a new return and it causes uninitialized data
bugs in a couple of the callers: print_codec_info() and
hdmi_parse_codec().

Fixes: e8a7f136f5ed ('[ALSA] hda-intel - Improve HD-audio codec probing robustness')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 sound/pci/hda/hda_codec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e938a68625ea..fed93cb2ee2f 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -329,8 +329,10 @@ int snd_hda_get_sub_nodes(struct hda_codec *codec, hda_nid_t nid,
 	unsigned int parm;
 
 	parm = snd_hda_param_read(codec, nid, AC_PAR_NODE_COUNT);
-	if (parm == -1)
+	if (parm == -1) {
+		*start_id = 0;
 		return 0;
+	}
 	*start_id = (parm >> 16) & 0x7fff;
 	return (int)(parm & 0x7fff);
 }
-- 
2.2.2

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