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Commit 5d9a2b0e authored by Leon Romanovsky's avatar Leon Romanovsky Committed by Jason Gunthorpe
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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: f26c7c83 ("i40iw: Add 2MB page support")
Signed-off-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent f1228867

drivers/infiniband/hw/i40iw/i40iw_verbs.c

+2 −0
Original line number Diff line number Diff line
@@ -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);

}



/**