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RDMA/umem: Fix missing mmap_sem in get umem ODP call

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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>
This commit is contained in:
Leon Romanovsky 2017-05-21 19:08:09 +03:00 committed by Doug Ledford
parent 53376fedb9
commit 79bb5b7ee1
1 changed files with 5 additions and 1 deletions
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6
drivers/infiniband/core/umem_odp.c
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@ -321,11 +321,15 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem,
struct vm_area_struct *vma;
struct hstate *h;
down_read(&mm->mmap_sem);
vma = find_vma(mm, ib_umem_start(umem));
if (!vma || !is_vm_hugetlb_page(vma))
if (!vma || !is_vm_hugetlb_page(vma)) {
up_read(&mm->mmap_sem);
return -EINVAL;
}
h = hstate_vma(vma);
umem->page_shift = huge_page_shift(h);
up_read(&mm->mmap_sem);
umem->hugetlb = 1;
} else {
umem->hugetlb = 0;