IB/mlx5: Fix possible array overflow
The check to verify that userspace does not provide an invalid index to the micro UAR was placed too late. Fix this by moving the check before using the index. Reported by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Eli Cohen <eli@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
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