From: Prasad J Pandit <pjp@fedoraproject.org>
Date: Thu, 7 Apr 2016 10:26:02 +0000 (+0530)
Subject: net: mipsnet: check packet length against buffer
X-Git-Tag: v2.7.0-rc0~157^2~29
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3af9187fc6caaf415ab9c0c6d92c9678f65cb17f;p=thirdparty%2Fqemu.git

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>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---

diff --git a/hw/net/mipsnet.c b/hw/net/mipsnet.c
index 740cd98ff1f..cf8b8236df8 100644
--- a/hw/net/mipsnet.c
+++ b/hw/net/mipsnet.c
@@ -83,6 +83,9 @@ static ssize_t mipsnet_receive(NetClientState *nc, const uint8_t *buf, size_t si
     if (!mipsnet_can_receive(nc))
         return 0;
 
+    if (size >= sizeof(s->rx_buffer)) {
+        return 0;
+    }
     s->busy = 1;
 
     /* Just accept everything. */