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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Shuah Khan <shuah@kernel.org>
Subject: [PATCH 4.9 34/65] usbip: Fix vhci_urb_enqueue() URB null transfer buffer error path
Date:   Mon, 11 Nov 2019 19:28:34 +0100
Message-Id: <20191111181346.896360052@linuxfoundation.org>
In-Reply-To: <20191111181331.917659011@linuxfoundation.org>
References: <20191111181331.917659011@linuxfoundation.org>
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From: Shuah Khan <shuah@kernel.org>

commit 2c904963b1dd2acd4bc785b6c72e10a6283c2081 upstream.

Fix vhci_urb_enqueue() to print debug msg and return error instead of
failing with BUG_ON.

Signed-off-by: Shuah Khan <shuah@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/usbip/vhci_hcd.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -512,8 +512,10 @@ static int vhci_urb_enqueue(struct usb_h
 	}
 	vdev = &vhci->vdev[portnum-1];
 
-	/* patch to usb_sg_init() is in 2.5.60 */
-	BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
+	if (!urb->transfer_buffer && urb->transfer_buffer_length) {
+		dev_dbg(dev, "Null URB transfer buffer\n");
+		return -EINVAL;
+	}
 
 	spin_lock_irqsave(&vhci->lock, flags);