[PULL 3/6] usb/hcd-xhci: check slotid in xhci_wakeup_endpoint()

[Gerd Hoffmann]

From: Mauro Matteo Cascella <mcasc...@redhat.com>

This prevents an OOB read (followed by an assertion failure in
xhci_kick_ep) when slotid > xhci->numslots.

Reported-by: Soul Chen <soulchen8...@gmail.com>
Signed-off-by: Mauro Matteo Cascella <mcasc...@redhat.com>
Message-Id: <20220705174734.2348829-1-mcasc...@redhat.com>
Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 hw/usb/hcd-xhci.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 0cd0a5e54027..296cc6c8e694 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -3269,7 +3269,8 @@ static void xhci_wakeup_endpoint(USBBus *bus, USBEndpoint 
*ep,
 
     DPRINTF("%s\n", __func__);
     slotid = ep->dev->addr;
-    if (slotid == 0 || !xhci->slots[slotid-1].enabled) {
+    if (slotid == 0 || slotid > xhci->numslots ||
+        !xhci->slots[slotid - 1].enabled) {
         DPRINTF("%s: oops, no slot for dev %d\n", __func__, ep->dev->addr);
         return;
     }
-- 
2.36.1