| Message ID | 20240202051829.623273-1-Frank.Li@nxp.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [1/2] usb: cdns3: fixed memory use after free at cdns3_gadget_ep_disable() | expand |
On 02/02/2024 07:18, 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@vger.kernel.org> > Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") > Signed-off-by: Frank Li <Frank.Li@nxp.com> Reviewed-by: Roger Quadros <rogerq@kernel.org>
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; }
... 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@vger.kernel.org> Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") Signed-off-by: Frank Li <Frank.Li@nxp.com> --- drivers/usb/cdns3/cdns3-gadget.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)