RDMA/umem: Fix missing mmap_sem in get umem ODP call
Add mmap_sem lock around VMA inspection in ib_umem_odp_get().
Fixes: 0008b84ea9
('IB/umem: Add support to huge ODP')
Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Reviewed-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -321,11 +321,15 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem,
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struct vm_area_struct *vma;
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struct hstate *h;
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down_read(&mm->mmap_sem);
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vma = find_vma(mm, ib_umem_start(umem));
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if (!vma || !is_vm_hugetlb_page(vma))
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if (!vma || !is_vm_hugetlb_page(vma)) {
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up_read(&mm->mmap_sem);
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return -EINVAL;
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}
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h = hstate_vma(vma);
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umem->page_shift = huge_page_shift(h);
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up_read(&mm->mmap_sem);
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umem->hugetlb = 1;
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} else {
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umem->hugetlb = 0;
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