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SubjectRe: [PATCH 1/2] usbip: Fix receive error in vhci-hcd when using scatter-gather
On Thu, Dec 12, 2019 at 02:28:40PM +0900, Suwan Kim wrote:
> 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>
> Signed-off-by: Suwan Kim <suwan.kim027@gmail.com>

Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

> ---
> 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)

--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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