When receiving packets over Stellaris ethernet controller, it
uses receive buffer of size 2048 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>
Message-id:
1460095428-22698-1-git-send-email-ppandit@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
n = s->next_packet + s->np;
if (n >= 31)
n -= 31;
- s->np++;
+ if (size >= sizeof(s->rx[n].data) - 6) {
+ /* If the packet won't fit into the
+ * emulated 2K RAM, this is reported
+ * as a FIFO overrun error.
+ */
+ s->ris |= SE_INT_FOV;
+ stellaris_enet_update(s);
+ return -1;
+ }
+
+ s->np++;
s->rx[n].len = size + 6;
p = s->rx[n].data;
*(p++) = (size + 6);