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[PULL,V3,02/20] net: mipsnet: check packet length against buffer

Message ID 1464228995-26657-3-git-send-email-jasowang@redhat.com
State New
Headers show

Commit Message

Jason Wang May 26, 2016, 2:16 a.m. UTC 
From: Prasad J Pandit <pjp@fedoraproject.org>

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>
---
 hw/net/mipsnet.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox

Patch

diff --git a/hw/net/mipsnet.c b/hw/net/mipsnet.c
index 740cd98..cf8b823 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. */