ALSA: usb-audio: fix rate_list memory leak

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@gmail.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 0eed6115c2d444e166d770008238d5e11e4800fb..67a4d6dbb32be748123442c829f27e4cb82a6f5c 100644 (file)
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -699,6 +699,9 @@ 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;