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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>

(cherry picked from commit 3af9187fc6)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Prasad J Pandit 2016-04-07 15:56:02 +05:30 committed by Michael Roth
parent 780d8317c8
commit 7a2c32ec06
1 changed files with 3 additions and 0 deletions
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3
hw/net/mipsnet.c
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@ -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. */