tree 1fcd168443ab177bad21233c8ffd65625e7781d3
parent dca02651cee78260ad9b6f1dce8f40b28367b7e2
author Eli Cohen <eli@mellanox.com> 1483480519 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1498281075 +0200

IB/mlx5: Fix kernel to user leak prevention logic

commit de8d6e02efbdb259c67832ccf027d7ace9b91d5d upstream.

The logic was broken as it failed to update the response length for
architectures with PAGE_SIZE larger than 4kB. As a result further
extension of the ucontext response struct would fail.

Fixes: d69e3bcf7976 ('IB/mlx5: Mmap the HCA's core clock register to user-space')
Signed-off-by: Eli Cohen <eli@mellanox.com>
Reviewed-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>