linux-kernel - [PATCH] USB: lvtest: return proper error code in probe

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Message-Id: <20200805090643.3432-1-novikov@ispras.ru>
Date:   Wed,  5 Aug 2020 12:06:43 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        linux-usb@...r.kernel.org (open list:USB SUBSYSTEM),
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] USB: lvtest: return proper error code in probe

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

diff --git a/drivers/usb/misc/lvstest.c b/drivers/usb/misc/lvstest.c
index 407fe7570f3b..f8686139d6f3 100644
--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -426,7 +426,7 @@ static int lvs_rh_probe(struct usb_interface *intf,
 			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 */
-- 
2.26.2