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 860ef6cd3f90b84a1832f8a6485c90c34d3b588b Mon Sep 17 00:00:00 2001

From: Minas Harutyunyan Minas.Harutyunyan@synopsys.com Date: Tue, 21 Jan 2020 14:24:04 +0400 Subject: [PATCH] usb: dwc2: Fix in ISOC request length checking

Moved ISOC request length checking from dwc2_hsotg_start_req() function to dwc2_hsotg_ep_queue().

Fixes: 4fca54aa58293 ("usb: gadget: s3c-hsotg: add multi count support") Signed-off-by: Minas Harutyunyan hminas@synopsys.com Signed-off-by: Felipe Balbi balbi@kernel.org

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 88f7d6d4ff2d..7b40cf5bdc2f 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -1083,11 +1083,6 @@ static void dwc2_hsotg_start_req(struct dwc2_hsotg *hsotg, else packets = 1; /* send one packet if length is zero. */

- if (hs_ep->isochronous && length > (hs_ep->mc * hs_ep->ep.maxpacket)) { - dev_err(hsotg->dev, "req length > maxpacket*mc\n"); - return; - } - if (dir_in && index != 0) if (hs_ep->isochronous) epsize = DXEPTSIZ_MC(packets); @@ -1391,6 +1386,13 @@ static int dwc2_hsotg_ep_queue(struct usb_ep *ep, struct usb_request *req, req->actual = 0; req->status = -EINPROGRESS;

+ /* Don't queue ISOC request if length greater than mps*mc */ + if (hs_ep->isochronous && + req->length > (hs_ep->mc * hs_ep->ep.maxpacket)) { + dev_err(hs->dev, "req length > maxpacket*mc\n"); + return -EINVAL; + } + /* In DDMA mode for ISOC's don't queue request if length greater * than descriptor limits. */