[PATCH 3.16 017/192] [media] mceusb: fix memory leaks in error path

[Ben Hutchings]

3.16.49-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Johan Hovold <johan@xxxxxxxxxx>

commit 2d5a6ce71c72d98d4f7948672842e3e8c265a8b7 upstream.

Fix urb and transfer-buffer leaks in an urb-submission error path which
may be hit when a device is disconnected.

Fixes: 66e89522aff7 ("V4L/DVB: IR: add mceusb IR receiver driver")

Cc: Jarod Wilson <jarod@xxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Sean Young <sean@xxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxxx>
[bwh: Backported to 3.16:
 - Add check on urb_type, as async_buf and async_urb aren't always allocated
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -765,6 +765,7 @@ static void mce_request_packet(struct mc
 	} else if (urb_type == MCEUSB_RX) {
 		/* standard request */
 		async_urb = ir->urb_in;
+		async_buf = NULL;
 		ir->send_flags = RECV_FLAG_IN_PROGRESS;
 
 	} else {
@@ -780,6 +781,10 @@ static void mce_request_packet(struct mc
 	res = usb_submit_urb(async_urb, GFP_ATOMIC);
 	if (res) {
 		dev_err(dev, "receive request FAILED! (res=%d)", res);
+		if (urb_type == MCEUSB_TX) {
+			kfree(async_buf);
+			usb_free_urb(async_urb);
+		}
 		return;
 	}
 	dev_dbg(dev, "receive request complete (res=%d)", res);