From d5d0b2805777fc5e007edb4a32349c912d886f94 Mon Sep 17 00:00:00 2001 From: Jakob Koschel Date: Tue, 8 Mar 2022 18:18:05 +0100 Subject: usb: gadget: omap_udc: remove usage of list iterator past the loop body If the list representing the request queue does not contain the expected request, the value of the list_for_each_entry() iterator will not point to a valid structure. To avoid type confusion in such case, the list iterator scope will be limited to the list_for_each_entry() loop. In preparation to limiting scope of the list iterator to the list traversal loop, use a dedicated pointer to point to the found request object [1]. Link: https://lore.kernel.org/all/YhdfEIwI4EdtHdym@kroah.com/ Signed-off-by: Jakob Koschel Link: https://lore.kernel.org/r/20220308171818.384491-14-jakobkoschel@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/udc/omap_udc.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/usb/gadget/udc/omap_udc.c b/drivers/usb/gadget/udc/omap_udc.c index 494da00398d7..2d9815dad2ff 100644 --- a/drivers/usb/gadget/udc/omap_udc.c +++ b/drivers/usb/gadget/udc/omap_udc.c @@ -1003,7 +1003,7 @@ irq_wait: static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) { struct omap_ep *ep = container_of(_ep, struct omap_ep, ep); - struct omap_req *req; + struct omap_req *req = NULL, *iter; unsigned long flags; if (!_ep || !_req) @@ -1012,11 +1012,13 @@ static int omap_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) spin_lock_irqsave(&ep->udc->lock, flags); /* make sure it's actually queued on this endpoint */ - list_for_each_entry(req, &ep->queue, queue) { - if (&req->req == _req) - break; + list_for_each_entry(iter, &ep->queue, queue) { + if (&iter->req != _req) + continue; + req = iter; + break; } - if (&req->req != _req) { + if (!req) { spin_unlock_irqrestore(&ep->udc->lock, flags); return -EINVAL; } -- cgit v1.2.3-59-g8ed1b