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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "stable@vger.kernel.org" <stable@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Leon Romanovsky <leonro@mellanox.com>,
        Jason Gunthorpe <jgg@mellanox.com>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.18 030/136] RDMA/i40w: Hold read semaphore while
 looking after VMA
Thread-Topic: [PATCH AUTOSEL 4.18 030/136] RDMA/i40w: Hold read semaphore
 while looking after VMA
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Date:   Mon, 17 Sep 2018 03:00:31 +0000
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From: Leon Romanovsky <leonro@mellanox.com>

[ Upstream commit 5d9a2b0e28759e319a623da33940dbb3ce952b7d ]

VMA lookup is supposed to be performed while mmap_sem is held.

Fixes: f26c7c83395b ("i40iw: Add 2MB page support")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/infiniband/hw/i40iw/i40iw_verbs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband=
/hw/i40iw/i40iw_verbs.c
index 68679ad4c6da..937899fea01d 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -1409,6 +1409,7 @@ static void i40iw_set_hugetlb_values(u64 addr, struct=
 i40iw_mr *iwmr)
 	struct vm_area_struct *vma;
 	struct hstate *h;
=20
+	down_read(&current->mm->mmap_sem);
 	vma =3D find_vma(current->mm, addr);
 	if (vma && is_vm_hugetlb_page(vma)) {
 		h =3D hstate_vma(vma);
@@ -1417,6 +1418,7 @@ static void i40iw_set_hugetlb_values(u64 addr, struct=
 i40iw_mr *iwmr)
 			iwmr->page_msk =3D huge_page_mask(h);
 		}
 	}
+	up_read(&current->mm->mmap_sem);
 }
=20
 /**
--=20
2.17.1