From dbfc29c2c70e855beedaff9f60ec1fd6aae16781 Mon Sep 17 00:00:00 2001 From: Suwan Kim 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=utf8 Content-Transfer-Encoding: 8bit commit d986294ee55d719562b20aabe15a39bf8f863415 upstream. 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 Tested-by: Marek Marczykowski-Górecki Signed-off-by: Suwan Kim Acked-by: Shuah Khan Cc: stable Link: https://lore.kernel.org/r/20191213023055.19933-2-suwan.kim027@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/usbip/usbip_common.c | 3 +++ 1 file changed, 3 insertions(+) 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) -- 2.34.1