| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.16 103/196] RDMA/mlx5: Protect from NULL pointer derefence | Date | Sun, 22 Apr 2018 15:52:03 +0200 |
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4.16-stable review patch. If anyone has any objections, please let me know.
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From: Leon Romanovsky <leonro@mellanox.com>
commit 4289861d88d6c7b5e4c8cc7fe2ad6cdf0cdfc366 upstream.
The mlx5_ib_alloc_implicit_mr() can fail to acquire pages and the returned mr pointer won't be valid. Ensure that it is not error prior to access.
Cc: <stable@vger.kernel.org> # 4.10 Fixes: 81713d3788d2 ("IB/mlx5: Add implicit MR support") Reported-by: Noa Osherovich <noaos@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/infiniband/hw/mlx5/mr.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/infiniband/hw/mlx5/mr.c +++ b/drivers/infiniband/hw/mlx5/mr.c @@ -1223,6 +1223,8 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct return ERR_PTR(-EINVAL); mr = mlx5_ib_alloc_implicit_mr(to_mpd(pd), access_flags); + if (IS_ERR(mr)) + return ERR_CAST(mr); return &mr->ibmr; } #endif
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