linux-kernel - [044/103] OSS: soundcard: locking bug in sound

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Date:	Fri, 22 Oct 2010 11:51:18 -0700
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,
	Dan Carpenter <error27@...il.com>,
	Arnd Bergmann <arnd@...db.de>, Takashi Iwai <tiwai@...e.de>
Subject: [044/103] OSS: soundcard: locking bug in sound_ioctl()

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

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

From: Dan Carpenter <error27@...il.com>

commit d4cfa4d12f46e2520f4c1d1a92e891ce068b7464 upstream.

We shouldn't return directly here because we're still holding the
&soundcard_mutex.

This bug goes all the way back to the start of git.  It's strange that
no one has complained about it as a runtime bug.

Signed-off-by: Dan Carpenter <error27@...il.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 sound/oss/soundcard.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/sound/oss/soundcard.c
+++ b/sound/oss/soundcard.c
@@ -389,11 +389,11 @@ static long sound_ioctl(struct file *fil
 	case SND_DEV_DSP:
 	case SND_DEV_DSP16:
 	case SND_DEV_AUDIO:
-		return audio_ioctl(dev, file, cmd, p);
+		ret = audio_ioctl(dev, file, cmd, p);
 		break;
 
 	case SND_DEV_MIDIN:
-		return MIDIbuf_ioctl(dev, file, cmd, p);
+		ret = MIDIbuf_ioctl(dev, file, cmd, p);
 		break;
 
 	}


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