@@ -1131,7 +1131,10 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance,
struct cxacru_data *instance;
struct usb_device *usb_dev = interface_to_usbdev(intf);
struct usb_host_endpoint *cmd_ep = usb_dev->ep_in[CXACRU_EP_CMD];
- struct usb_endpoint_descriptor *in, *out;
+ static const u8 ep_addrs[] = {
+ CXACRU_EP_CMD + USB_DIR_IN,
+ CXACRU_EP_CMD + USB_DIR_OUT,
+ 0};
int ret;
/* instance init */
@@ -1179,13 +1182,11 @@ static int cxacru_bind(struct usbatm_data *usbatm_instance,
}
if (usb_endpoint_xfer_int(&cmd_ep->desc))
- ret = usb_find_common_endpoints(intf->cur_altsetting,
- NULL, NULL, &in, &out);
+ ret = usb_check_int_endpoints(intf, ep_addrs);
else
- ret = usb_find_common_endpoints(intf->cur_altsetting,
- &in, &out, NULL, NULL);
+ ret = usb_check_bulk_endpoints(intf, ep_addrs);
- if (ret) {
+ if (!ret) {
usb_err(usbatm_instance, "cxacru_bind: interface has incorrect endpoints\n");
ret = -ENODEV;
goto fail;
Syzbot once again identified a flaw in usb endpoint checking, see [1]. This time the issue stems from a commit authored by me (2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()")). While using usb_find_common_endpoints() may usually be enough to discard devices with wrong endpoints, in this case one needs more than just finding and identifying the sufficient number of endpoints of correct types - one needs to check the endpoint's address as well. Since cxacru_bind() fills URBs with CXACRU_EP_CMD address in mind, switch the endpoint verification approach to usb_check_XXX_endpoints() instead to fix incomplete ep testing. [1] Syzbot report: usb 5-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 0 PID: 1378 at drivers/usb/core/urb.c:504 usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... RIP: 0010:usb_submit_urb+0xc4e/0x18c0 drivers/usb/core/urb.c:503 ... Call Trace: <TASK> cxacru_cm+0x3c8/0xe50 drivers/usb/atm/cxacru.c:649 cxacru_card_status drivers/usb/atm/cxacru.c:760 [inline] cxacru_bind+0xcf9/0x1150 drivers/usb/atm/cxacru.c:1223 usbatm_usb_probe+0x314/0x1d30 drivers/usb/atm/usbatm.c:1058 cxacru_usb_probe+0x184/0x220 drivers/usb/atm/cxacru.c:1377 usb_probe_interface+0x641/0xbb0 drivers/usb/core/driver.c:396 really_probe+0x2b9/0xad0 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 ... Reported-and-tested-by: syzbot+ccbbc229a024fa3e13b5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=ccbbc229a024fa3e13b5 Fixes: 2eabb655a968 ("usb: atm: cxacru: fix endpoint checking in cxacru_bind()") Cc: stable@kernel.org Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru> --- P.S. another option would be to try to use endpoints found by usb_find_common_endpoints() and use them to fill and send URBs. But this may interfere with real devices and I have no way of testing them myself. drivers/usb/atm/cxacru.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)