File 0247-net-mipsnet-check-packet-length-aga.patch of Package qemu.3217

From 71b175d9c9af258b9d7ddcc64d07cb849f63330d Mon Sep 17 00:00:00 2001
From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 7 Apr 2016 04:27:00 -0600
Subject: [PATCH] net: mipsnet: check packet length against buffer

When receiving packets over MIPSnet network device, it uses
 receive buffer of size 1514 bytes. In case the controller
accepts large(MTU) packets, it could lead to memory corruption.
Add check to avoid it.

Reported by: Oleksandr Bazhaniuk <oleksandr.bazhaniuk@intel.com>

Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
[BR: BSC#975136 CVE-2016-4002]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/net/mipsnet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/net/mipsnet.c b/hw/net/mipsnet.c
index e421b86..4d0c975 100644
--- a/hw/net/mipsnet.c
+++ b/hw/net/mipsnet.c
@@ -82,6 +82,9 @@ static ssize_t mipsnet_receive(NetClientState *nc, const uint8_t *buf, size_t si
     if (!mipsnet_can_receive(nc))
         return -1;
 
+    if (size >= sizeof(s->rx_buffer)) {
+        return 0;
+    }
     s->busy = 1;
 
     /* Just accept everything. */