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/[email protected]/
Signed-off-by: Jakob Koschel <[email protected]>
---
drivers/usb/gadget/udc/s3c-hsudc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/gadget/udc/s3c-hsudc.c b/drivers/usb/gadget/udc/s3c-hsudc.c
index 89f1f8c9f02e..ddfc30b1d248 100644
--- a/drivers/usb/gadget/udc/s3c-hsudc.c
+++ b/drivers/usb/gadget/udc/s3c-hsudc.c
@@ -877,7 +877,7 @@ static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
{
struct s3c_hsudc_ep *hsep = our_ep(_ep);
struct s3c_hsudc *hsudc = hsep->dev;
- struct s3c_hsudc_req *hsreq;
+ struct s3c_hsudc_req *hsreq = NULL, *tmp;
unsigned long flags;
hsep = our_ep(_ep);
@@ -886,11 +886,13 @@ static int s3c_hsudc_dequeue(struct usb_ep *_ep, struct usb_request *_req)
spin_lock_irqsave(&hsudc->lock, flags);
- list_for_each_entry(hsreq, &hsep->queue, queue) {
- if (&hsreq->req == _req)
+ list_for_each_entry(tmp, &hsep->queue, queue) {
+ if (&tmp->req == _req) {
+ hsreq = tmp;
break;
+ }
}
- if (&hsreq->req != _req) {
+ if (!hsreq) {
spin_unlock_irqrestore(&hsudc->lock, flags);
return -EINVAL;
}
--
2.25.1