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RDMA/odp: Check for overflow when computing the umem_odp end

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Since the page size can be extended in the ODP case by IB_ACCESS_HUGETLB
the existing overflow checks done by ib_umem_get() are not
sufficient. Check for overflow again.

Further, remove the unchecked math from the inlines and just use the
precomputed value stored in the interval_tree_node.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Leon Romanovsky <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
This commit is contained in:
Jason Gunthorpe 2019-08-19 14:17:06 +03:00
commit 204e3e5630
2 changed files with 21 additions and 9 deletions
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5
include/rdma/ib_umem_odp.h
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@ -91,14 +91,13 @@ static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
/* Returns the first page of an ODP umem. */
static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
{
return ALIGN_DOWN(umem_odp->umem.address, 1UL << umem_odp->page_shift);
return umem_odp->interval_tree.start;
}
/* Returns the address of the page after the last one of an ODP umem. */
static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
{
return ALIGN(umem_odp->umem.address + umem_odp->umem.length,
1UL << umem_odp->page_shift);
return umem_odp->interval_tree.last + 1;
}
static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)