From: Felipe Balbi <balbi@ti.com>
Date: Tue, 29 May 2012 11:36:42 +0000 (+0300)
Subject: usb: gadget: omap_udc: remove possiblity of NULL pointer de-reference
X-Git-Tag: firefly_0821_release~3680^2~2357^2~24^2~35^2~33
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=70617db7ad7395498e6bc54c634199bf895426c6;p=firefly-linux-kernel-4.4.55.git

usb: gadget: omap_udc: remove possiblity of NULL pointer de-reference

when allocating a request, it's better programming
practice to make sure we return NULL if allocation
failed.

This will ensure that, if struct usb_request isn't
the first member on our structure, we don't cheat
the gadget driver into thinking allocating worked
because pointer isn't 0.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index 814aafbed000..f13bcdc75676 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -268,10 +268,12 @@ omap_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
 	struct omap_req	*req;
 
 	req = kzalloc(sizeof(*req), gfp_flags);
-	if (req) {
-		req->req.dma = DMA_ADDR_INVALID;
-		INIT_LIST_HEAD(&req->queue);
-	}
+	if (!req)
+		return NULL;
+
+	req->req.dma = DMA_ADDR_INVALID;
+	INIT_LIST_HEAD(&req->queue);
+
 	return &req->req;
 }