RDMA/core: Ensure that rdma_user_mmap_entry_remove() is a fence

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commit 6b3712c024 upstream.

The set of entry->driver_removed is missing locking, protect it with
xa_lock() which is held by the only reader.

Otherwise readers may continue to see driver_removed = false after
rdma_user_mmap_entry_remove() returns and may continue to try and
establish new mmaps.

Fixes: 3411f9f01b ("RDMA/core: Create mmap database and cookie helper functions")
Link: https://lore.kernel.org/r/20200115202041.GA17199@ziepe.ca
Reviewed-by: Gal Pressman <galpress@amazon.com>
Acked-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jason Gunthorpe 2020-01-15 20:20:44 +00:00 • committed by Greg Kroah-Hartman

parent 2a4b19c30a

commit 89f28e2f72

1 changed files with 2 additions and 0 deletions

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drivers/infiniband/core/ib_core_uverbs.c

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