@@ -844,7 +844,7 @@ mv_u3d_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
static int mv_u3d_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct mv_u3d_ep *ep;
- struct mv_u3d_req *req;
+ struct mv_u3d_req *req = NULL, *iter;
struct mv_u3d *u3d;
struct mv_u3d_ep_context *ep_context;
struct mv_u3d_req *next_req;
@@ -861,11 +861,13 @@ static int mv_u3d_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
spin_lock_irqsave(&ep->u3d->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) {
ret = -EINVAL;
goto out;
}
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> --- drivers/usb/gadget/udc/mv_u3d_core.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)