[PATCH 3.2 05/74] [media] mceusb: fix memory leaks in error path

[Ben Hutchings]

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

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

From: Johan Hovold <jo...@kernel.org>

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 <ja...@redhat.com>
Signed-off-by: Johan Hovold <jo...@kernel.org>
Signed-off-by: Sean Young <s...@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
[bwh: Backported to 3.2:
 - Add check on urb_type, as async_buf and async_urb aren't always allocated
 - Adjust context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/media/rc/mceusb.c
+++ b/drivers/media/rc/mceusb.c
@@ -739,6 +739,7 @@ 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 {
@@ -754,6 +755,10 @@ static void mce_request_packet(struct mc
        res = usb_submit_urb(async_urb, GFP_ATOMIC);
        if (res) {
                mce_dbg(dev, "receive request FAILED! (res=%d)\n", res);
+               if (urb_type == MCEUSB_TX) {
+                       kfree(async_buf);
+                       usb_free_urb(async_urb);
+               }
                return;
        }
        mce_dbg(dev, "receive request complete (res=%d)\n", res);