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RDMA/i40w: Hold read semaphore while looking after VMA 

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

Fixes: f26c7c8339 ("i40iw: Add 2MB page support")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
hifive-unleashed-5.1
Leon Romanovsky 2018-07-01 19:36:24 +03:00 committed by Jason Gunthorpe
parent f1228867ad
commit 5d9a2b0e28
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/i40iw/i40iw_verbs.c
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@ -1410,6 +1410,7 @@ static void i40iw_set_hugetlb_values(u64 addr, struct i40iw_mr *iwmr)
struct vm_area_struct *vma;
struct hstate *h;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm, addr);
if (vma && is_vm_hugetlb_page(vma)) {
h = hstate_vma(vma);
@ -1418,6 +1419,7 @@ static void i40iw_set_hugetlb_values(u64 addr, struct i40iw_mr *iwmr)
iwmr->page_msk = huge_page_mask(h);
}
}
up_read(&current->mm->mmap_sem);
}
/**