[PATCH 4.9 52/78] USB: lvtest: return proper error code in probe

Greg Kroah-Hartman
2020-09-01T17:11:51Z

From: Evgeny Novikov <novikov@ispras.ru>

commit 531412492ce93ea29b9ca3b4eb5e3ed771f851dd upstream.

lvs_rh_probe() can return some nonnegative value from usb_control_msg()
when it is less than "USB_DT_HUB_NONVAR_SIZE + 2" that is considered as
a failure. Make lvs_rh_probe() return -EINVAL in this case.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200805090643.3432-1-novikov@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/misc/lvstest.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -392,7 +392,7 @@ static int lvs_rh_probe(struct usb_inter
USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT);
if (ret < (USB_DT_HUB_NONVAR_SIZE + 2)) {
dev_err(&hdev->dev, "wrong root hub descriptor read %d\n", ret);
- return ret;
+ return ret < 0 ? ret : -EINVAL;
}

/* submit urb to poll interrupt endpoint */