[PATCH] can: pcan_usb_core: fix memory leak on failure paths in peak_usb_start()

[Stephane Grosjean <s.grosjean@peak-system.com>]

Tx and rx urbs are not deallocated if something goes wrong in peak_usb_start().
The patch fixes error handling to deallocate all the resources.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Stephane Grosjean <s.grosjean@peak-system.com>
---
 drivers/net/can/usb/peak_usb/pcan_usb_core.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_core.c b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
index a0f647f..0b7a4c3 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_core.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_core.c
@@ -463,7 +463,7 @@ static int peak_usb_start(struct peak_usb_device *dev)
     if (i < PCAN_USB_MAX_TX_URBS) {
         if (i == 0) {
             netdev_err(netdev, "couldn't setup any tx URB\n");
-            return err;
+            goto err_tx;
         }
 
         netdev_warn(netdev, "tx performance may be slow\n");
@@ -472,7 +472,7 @@ static int peak_usb_start(struct peak_usb_device *dev)
     if (dev->adapter->dev_start) {
         err = dev->adapter->dev_start(dev);
         if (err)
-            goto failed;
+            goto err_adapter;
     }
 
     dev->state |= PCAN_USB_STATE_STARTED;
@@ -481,19 +481,26 @@ static int peak_usb_start(struct peak_usb_device *dev)
     if (dev->adapter->dev_set_bus) {
         err = dev->adapter->dev_set_bus(dev, 1);
         if (err)
-            goto failed;
+            goto err_adapter;
     }
 
     dev->can.state = CAN_STATE_ERROR_ACTIVE;
 
     return 0;
 
-failed:
+err_adapter:
     if (err == -ENODEV)
         netif_device_detach(dev->netdev);
 
     netdev_warn(netdev, "couldn't submit control: %d\n", err);
 
+    for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
+        usb_free_urb(dev->tx_contexts[i].urb);
+        dev->tx_contexts[i].urb = NULL;
+    }
+err_tx:
+    usb_kill_anchored_urbs(&dev->rx_submitted);
+
     return err;
 }
 
--
1.8.1.2

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