From e43f0019b0aff881c562c8d2428bce6b3d55845c Mon Sep 17 00:00:00 2001
From: Li Qiang <liq3ea@163.com>
Date: Fri, 18 Sep 2020 11:08:28 +0800
Subject: [PATCH] hw: xhci: check return value of 'usb_packet_map'

Currently we don't check the return value of 'usb_packet_map',
this will cause an NAF issue. This is LP#1891341.
Following is the reproducer provided in:
-->https://bugs.launchpad.net/qemu/+bug/1891341

This patch fixes this.

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index a21485fe..3b25abca 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1614,7 +1614,10 @@ static int xhci_setup_packet(XHCITransfer *xfer)
     xhci_xfer_create_sgl(xfer, dir == USB_TOKEN_IN); /* Also sets int_req */
     usb_packet_setup(&xfer->packet, dir, ep, xfer->streamid,
                      xfer->trbs[0].addr, false, xfer->int_req);
-    usb_packet_map(&xfer->packet, &xfer->sgl);
+    if (usb_packet_map(&xfer->packet, &xfer->sgl)) {
+		qemu_sglist_destroy(&xfer->sgl);
+		return -1;
+	}
     DPRINTF("xhci: setup packet pid 0x%x addr %d ep %d\n",
             xfer->packet.pid, ep->dev->addr, ep->nr);
     return 0;
-- 
2.23.0