On 24-02-02 10:42:16, Frank Li wrote:
> ...
> cdns3_gadget_ep_free_request(&priv_ep->endpoint, &priv_req->request);
> list_del_init(&priv_req->list);
> ...
>
> 'priv_req' actually free at cdns3_gadget_ep_free_request(). But
> list_del_init() use priv_req->list after it.
>
> [ 1542.642868][ T534] BUG: KFENCE: use-after-free read in __list_del_entry_valid+0x10/0xd4
> [ 1542.642868][ T534]
> [ 1542.653162][ T534] Use-after-free read at 0x000000009ed0ba99 (in kfence-#3):
> [ 1542.660311][ T534] __list_del_entry_valid+0x10/0xd4
> [ 1542.665375][ T534] cdns3_gadget_ep_disable+0x1f8/0x388 [cdns3]
> [ 1542.671571][ T534] usb_ep_disable+0x44/0xe4
> [ 1542.675948][ T534] ffs_func_eps_disable+0x64/0xc8
> [ 1542.680839][ T534] ffs_func_set_alt+0x74/0x368
> [ 1542.685478][ T534] ffs_func_disable+0x18/0x28
>
> Move list_del_init() before cdns3_gadget_ep_free_request() to resolve this
> problem.
>
> Cc: <stable@xxxxxxxxxxxxxxx>
> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver")
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> Reviewed-by: Roger Quadros <rogerq@xxxxxxxxxx>
Acked-by: Peter Chen <peter.chen@xxxxxxxxxx>
> ---
> drivers/usb/cdns3/cdns3-gadget.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index aeca902ab6cc4..d6723d31fc6e2 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -2540,11 +2540,11 @@ 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;
> }
>
> --
> 2.34.1
>
--
Thanks,
Peter Chen
