The patch below does not apply to the 3.18-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From f26d29e34e203296140334087fa3c81168626d76 Mon Sep 17 00:00:00 2001
From: "John W. Linville" <[email protected]>
Date: Tue, 6 Jan 2015 14:49:47 -0500
Subject: [PATCH] usb: gadget: udc: avoid dereference before NULL check in
 ep_queue

Coverity: CID 1260069

Signed-off-by: John W. Linville <[email protected]>
Cc: Felipe Balbi <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/drivers/usb/gadget/udc/bdc/bdc_ep.c 
b/drivers/usb/gadget/udc/bdc/bdc_ep.c
index ff67ceac77c4..d4fe8d769bd6 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_ep.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_ep.c
@@ -718,10 +718,11 @@ static int ep_queue(struct bdc_ep *ep, struct bdc_req 
*req)
        struct bdc *bdc;
        int ret = 0;
 
-       bdc = ep->bdc;
        if (!req || !ep || !ep->usb_ep.desc)
                return -EINVAL;
 
+       bdc = ep->bdc;
+
        req->usb_req.actual = 0;
        req->usb_req.status = -EINPROGRESS;
        req->epnum = ep->ep_num;

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