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RDMA/mlx5: Protect from NULL pointer derefence

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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: 81713d3788 ("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>
This commit is contained in:
Leon Romanovsky 2018-03-13 15:29:24 +02:00 • committed by Doug Ledford
commit 4289861d88
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/mlx5/mr.c
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@ -1232,6 +1232,8 @@ struct ib_mr *mlx5_ib_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
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