From 95ed56939eb2eaa4e2f349fe6dcd13ca4edfd8fb Mon Sep 17 00:00:00 2001
From: Li Qiang <liqiang6-s@360.cn>
Date: Tue, 7 Feb 2017 02:23:33 -0800
Subject: [PATCH] usb: ohci: limit the number of link eds

The guest may builds an infinite loop with link eds. This patch
limit the number of linked ed to avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Message-id: 5899a02e.45ca240a.6c373.93c1@mx.google.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/usb-ohci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/hw/usb-ohci.c b/hw/usb-ohci.c
index 2cba3e3..21c93e0 100644
--- a/hw/usb-ohci.c
+++ b/hw/usb-ohci.c
@@ -42,6 +42,8 @@
 
 #define OHCI_MAX_PORTS 15
 
+#define ED_LINK_LIMIT 4
+
 static int64_t usb_frame_time;
 static int64_t usb_bit_time;
 
@@ -1184,7 +1186,7 @@ static int ohci_service_ed_list(OHCIState *ohci, uint32_t head, int completion)
     uint32_t next_ed;
     uint32_t cur;
     int active;
-
+    uint32_t link_cnt = 0;
     active = 0;
 
     if (head == 0)
@@ -1199,6 +1201,10 @@ static int ohci_service_ed_list(OHCIState *ohci, uint32_t head, int completion)
 
         next_ed = ed.next & OHCI_DPTR_MASK;
 
+        if (++link_cnt > ED_LINK_LIMIT) {
+            return 0;
+        }
+
         if ((ed.head & OHCI_ED_H) || (ed.flags & OHCI_ED_K)) {
             uint32_t addr;
             /* Cancel pending packets for ED that have been paused.  */
-- 
1.8.3.1