This is against the em28xx driver from mcentral.de,
which leaked 3x16KiB chunks of kernel mem for every iteration.
Iterations for me were triggered by channel changes in VLC.

diff -Naur em28xx-new-cd98ca2bc3cd/em28xx-audio.c em28xx-new-1/em28xx-audio.c
--- em28xx-new-cd98ca2bc3cd/em28xx-audio.c	2009-01-05 14:45:58.000000000 +0000
+++ em28xx-new-1/em28xx-audio.c	2009-01-09 16:39:34.000000000 +0000
@@ -425,15 +425,17 @@
 	return;
 }
 
-static int em28xx_isoc_audio_deinit(struct em28xx *dev)
+static void em28xx_isoc_audio_deinit(struct em28xx *dev)
 {
 	int i;
 	for (i = 0; i < EM28XX_AUDIO_BUFS; i++) {
 		usb_kill_urb(dev->adev->urb[i]);
 		usb_free_urb(dev->adev->urb[i]);
 		dev->adev->urb[i] = NULL;
+
+		kfree(dev->adev->transfer_buffer[i]);
+		dev->adev->transfer_buffer[i] = NULL;
 	}
-	return 0;
 }
 
 static int em28xx_init_audio_isoc(struct em28xx *dev)