RDMA/umem: Fix potential addition overflow
Given a large enough memory allocation, it is possible to wrap the pinned_vm counter. Check for addition overflow to prevent such eventualities. Fixes: 40ddacf2 ("RDMA/umem: Don't hold mmap_sem for too long") Reported-by: Jason Gunthorpe <jgg@ziepe.ca> Signed-off-by: Doug Ledford <dledford@redhat.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
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