2012/5/18 Clemens Ladisch clemens@ladisch.de:
Please try this patch.
--8<---------------------------------------------------------------->8-- ALSA: usb-audio: fix rate_list memory leak
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
sound/usb/pcm.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
--- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -783,6 +783,9 @@ 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;
I have applied this on top of 3.4.0. So far, the microphone works, and there are no leaks detected.