RDMA/umem: Fix potential addition overflow

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Given a large enough memory allocation, it is possible to wrap the
pinned_vm counter.  Check for addition overflow to prevent such
eventualities.

Fixes: 40ddacf2dd ("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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Doug Ledford 2018-09-21 11:30:13 -04:00 • committed by Jason Gunthorpe

parent 3312d1c6bd

commit c6ce580716

1 changed files with 5 additions and 3 deletions

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8

drivers/infiniband/core/umem.c

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