kaweth: Fix memory leak in kaweth_control()

kaweth_control() never frees the buffer that it allocates for the USB
control message.  Test case:

while :; do ifconfig eth2 down ; ifconfig eth2 up ; done

This is a tiny buffer so it is a slow leak.  If you want to speed up the
process, you can change the allocation size to e.g. 16384 bytes, and it
will consume several megabytes within a few minutes.

Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Acked-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/net/usb/kaweth.c b/drivers/net/usb/kaweth.c
index e2a39b9be96e..e391ef969c28 100644
--- a/drivers/net/usb/kaweth.c
+++ b/drivers/net/usb/kaweth.c
@@ -263,6 +263,7 @@ static int kaweth_control(struct kaweth_device *kaweth,
                           int timeout)
 {
         struct usb_ctrlrequest *dr;
+        int retval;
 
         dbg("kaweth_control()");
 
@@ -278,18 +279,21 @@ static int kaweth_control(struct kaweth_device *kaweth,
                 return -ENOMEM;
         }
 
-        dr->bRequestType= requesttype;
+        dr->bRequestType = requesttype;
         dr->bRequest = request;
         dr->wValue = cpu_to_le16(value);
         dr->wIndex = cpu_to_le16(index);
         dr->wLength = cpu_to_le16(size);
 
-        return kaweth_internal_control_msg(kaweth->dev,
-                                        pipe,
-                                        dr,
-                                        data,
-                                        size,
-                                        timeout);
+        retval = kaweth_internal_control_msg(kaweth->dev,
+                                             pipe,
+                                             dr,
+                                             data,
+                                             size,
+                                             timeout);
+
+        kfree(dr);
+        return retval;
 }
 
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