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usb: gadget: udc: at91: 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 <jakobkoschel@gmail.com> Link: https://lore.kernel.org/r/20220308171818.384491-6-jakobkoschel@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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1 changed files with 7 additions and 5 deletions
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@ -704,7 +704,7 @@ static int at91_ep_queue(struct usb_ep *_ep,
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static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
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{
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struct at91_ep *ep;
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struct at91_request *req;
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struct at91_request *req = NULL, *iter;
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unsigned long flags;
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struct at91_udc *udc;
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@ -717,11 +717,13 @@ static int at91_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
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spin_lock_irqsave(&udc->lock, flags);
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/* make sure it's actually queued on this endpoint */
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list_for_each_entry (req, &ep->queue, queue) {
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if (&req->req == _req)
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break;
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list_for_each_entry(iter, &ep->queue, queue) {
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if (&iter->req != _req)
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continue;
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req = iter;
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break;
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}
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if (&req->req != _req) {
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if (!req) {
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spin_unlock_irqrestore(&udc->lock, flags);
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return -EINVAL;
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}
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