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From: P J P <pjp@fedoraproject.org>
Date: Tue, 15 Sep 2015 16:46:59 +0530
Subject: [PATCH] net: avoid infinite loop when receiving
 packets(CVE-2015-5278)

Ne2000 NIC uses ring buffer of NE2000_MEM_SIZE(49152)
bytes to process network packets. While receiving packets
via ne2000_receive() routine, a local 'index' variable
could exceed the ring buffer size, leading to an infinite
loop situation.

Reported-by: Qinghao Tang <luodalongde@gmail.com>
Signed-off-by: P J P <pjp@fedoraproject.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 737d2b3c41d59eb8f94ab7eb419b957938f24943)
---
 hw/net/ne2000.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 3492db3..44a4264 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -253,7 +253,7 @@ ssize_t ne2000_receive(NetClientState *nc, const uint8_t *buf, size_t size_)
         if (index <= s->stop)
             avail = s->stop - index;
         else
-            avail = 0;
+            break;
         len = size;
         if (len > avail)
             len = avail;