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This integer overflow was triggered with fuzzing on the virtio-net
device. The integer overflow is from the wrong assumption that the
packets read from or written to the tap device is always larger than the
size of a virtio-net header.
Signed-off-by: Bo Chen <chen.bo@intel.com>
(cherry picked from commit 559faa272a)
Signed-off-by: Rob Bradford <robert.bradford@intel.com>