The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From d986294ee55d719562b20aabe15a39bf8f863415 Mon Sep 17 00:00:00 2001

From: Suwan Kim suwan.kim027@gmail.com Date: Fri, 13 Dec 2019 11:30:54 +0900 Subject: [PATCH] usbip: Fix receive error in vhci-hcd when using scatter-gather MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

When vhci uses SG and receives data whose size is smaller than SG buffer size, it tries to receive more data even if it acutally receives all the data from the server. If then, it erroneously adds error event and triggers connection shutdown.

vhci-hcd should check if it received all the data even if there are more SG entries left. So, check if it receivces all the data from the server in for_each_sg() loop.

Fixes: ea44d190764b ("usbip: Implement SG support to vhci-hcd and stub driver") Reported-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Tested-by: Marek Marczykowski-Górecki marmarek@invisiblethingslab.com Signed-off-by: Suwan Kim suwan.kim027@gmail.com Acked-by: Shuah Khan skhan@linuxfoundation.org Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20191213023055.19933-2-suwan.kim027@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

diff --git a/drivers/usb/usbip/usbip_common.c b/drivers/usb/usbip/usbip_common.c index 6532d68e8808..e4b96674c405 100644 --- a/drivers/usb/usbip/usbip_common.c +++ b/drivers/usb/usbip/usbip_common.c @@ -727,6 +727,9 @@ int usbip_recv_xbuff(struct usbip_device *ud, struct urb *urb)

copy -= recv; ret += recv; + + if (!copy) + break; }

if (ret != size)