linux-kernel - [088/272] ALSA: hda - Fix NULL-derefence with a single mic in STAC auto-mic detection

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Date:	Tue, 15 Feb 2011 16:12:25 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Takashi Iwai <tiwai@...e.de>
Subject: [088/272] ALSA: hda - Fix NULL-derefence with a single mic in STAC auto-mic detection

2.6.37-stable review patch.  If anyone has any objections, please let us know.

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

From: Takashi Iwai <tiwai@...e.de>

commit 80c678526d7da73bde4d46a4622449c2b3c88409 upstream.

When only one mic is available and it's an analog mic, the current
IDT/STAC parser may give an Oops.

Reference: bko#25692
	https://bugzilla.kernel.org/show_bug.cgi?id=25692

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/pci/hda/patch_sigmatel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3591,7 +3591,7 @@ static int stac_check_auto_mic(struct hd
 		if (check_mic_pin(codec, spec->dmic_nids[i],
 		    &fixed, &ext, &dock))
 			return 0;
-	if (!fixed && !ext && !dock)
+	if (!fixed || (!ext && !dock))
 		return 0; /* no input to switch */
 	if (!(get_wcaps(codec, ext) & AC_WCAP_UNSOL_CAP))
 		return 0; /* no unsol support */


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