usb ethernet gadget, workaround network stack API glitch

Another workaround for the glitch in the network layer, whereby one call
ignores the (otherwise kernel-wide) convention that free() calls should
not oops when passed nulls.  This code already handles that API glitch in
most other paths.

From: Erik Hovland <erik@hovland.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index 8f9f217e0a686b59451f21fc10319524e3bc01ae..96df8413f39178c138053ff65895d55600afbdf7 100644 (file)
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -1735,7 +1735,8 @@ enomem:
                defer_kevent (dev, WORK_RX_MEMORY);
        if (retval) {
                DEBUG (dev, "rx submit --> %d\n", retval);
-               dev_kfree_skb_any (skb);
+               if (skb)
+                       dev_kfree_skb_any(skb);
                spin_lock(&dev->req_lock);
                list_add (&req->list, &dev->rx_reqs);
                spin_unlock(&dev->req_lock);