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usb: gadget: udc: pxa25x: 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/20220308171818.384491-5-jakobkoschel@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 8 additions and 5 deletions
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@ -966,7 +966,8 @@ static void nuke(struct pxa25x_ep *ep, int status)
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static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
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{
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struct pxa25x_ep *ep;
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struct pxa25x_request *req;
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struct pxa25x_request *req = NULL;
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struct pxa25x_request *iter;
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unsigned long flags;
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ep = container_of(_ep, struct pxa25x_ep, ep);
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@ -976,11 +977,13 @@ static int pxa25x_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
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local_irq_save(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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local_irq_restore(flags);
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return -EINVAL;
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}
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