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From 5a1ccdfe44946e726b4c6fda8a4493b3931a68c1 Mon Sep 17 00:00:00 2001
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)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
hw/net/ne2000.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/hw/net/ne2000.c b/hw/net/ne2000.c
index 9278571..2bdb4c9 100644
--- a/hw/net/ne2000.c
+++ b/hw/net/ne2000.c
@@ -256,7 +256,7 @@ 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;
--
1.7.0.4
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