[PATCH] usb: cdns3: Do not access memory after free

[Andrew Goodbody]

The call to cdns3_gadget_ep_free_request will free priv_req so do the
call to list_del_init which accesses the memory pointed to by priv_req
before the free.

This issue was found by Smatch.

Signed-off-by: Andrew Goodbody <andrew.goodbody at linaro.org>
---
 drivers/usb/cdns3/gadget.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/cdns3/gadget.c b/drivers/usb/cdns3/gadget.c
index a30c40ef80e..9eaf7e40ab6 100644
--- a/drivers/usb/cdns3/gadget.c
+++ b/drivers/usb/cdns3/gadget.c
@@ -557,10 +557,10 @@ static void cdns3_wa2_remove_old_request(struct cdns3_endpoint *priv_ep)
 
 		trace_cdns3_wa2(priv_ep, "removes eldest request");
 
+		list_del_init(&priv_req->list);
 		kfree(priv_req->request.buf);
 		cdns3_gadget_ep_free_request(&priv_ep->endpoint,
 					     &priv_req->request);
-		list_del_init(&priv_req->list);
 		--priv_ep->wa2_counter;
 
 		if (!chain)
@@ -1959,10 +1959,10 @@ static int cdns3_gadget_ep_disable(struct usb_ep *ep)
 	while (!list_empty(&priv_ep->wa2_descmiss_req_list)) {
 		priv_req = cdns3_next_priv_request(&priv_ep->wa2_descmiss_req_list);
 
+		list_del_init(&priv_req->list);
 		kfree(priv_req->request.buf);
 		cdns3_gadget_ep_free_request(&priv_ep->endpoint,
 					     &priv_req->request);
-		list_del_init(&priv_req->list);
 		--priv_ep->wa2_counter;
 	}
 

---
base-commit: 7807ed921314cd7af83fd88162d0b8c6fb20a9ca
change-id: 20250813-usb_cdns3-67b975488fe8

Best regards,
-- 
Andrew Goodbody <andrew.goodbody at linaro.org>