linux-kernel - [ 43/82] ALSA: usb-audio: fix rate

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Message-Id: <20120608041846.614544095@decadent.org.uk>
Date:	Fri, 08 Jun 2012 05:19:23 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Clemens Ladisch <clemens@...isch.de>,
	"Alexander E. Patrakov" <patrakov@...il.com>,
	Takashi Iwai <tiwai@...e.de>
Subject: [ 43/82] ALSA: usb-audio: fix rate_list memory leak

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

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

From: Clemens Ladisch <clemens@...isch.de>

commit 5cd5d7c44990658df6ab49f6253c39617c53b03d upstream.

The array of sample rates is reallocated every time when opening
the PCM device, but was freed only once when unplugging the device.

Reported-by: "Alexander E. Patrakov" <patrakov@...il.com>
Signed-off-by: Clemens Ladisch <clemens@...isch.de>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 sound/usb/pcm.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 24839d9..cdf8b76 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -788,6 +788,9 @@ static int snd_usb_pcm_check_knot(struct snd_pcm_runtime *runtime,
 	int count = 0, needs_knot = 0;
 	int err;
 
+	kfree(subs->rate_list.list);
+	subs->rate_list.list = NULL;
+
 	list_for_each_entry(fp, &subs->fmt_list, list) {
 		if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS)
 			return 0;


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