linux-kernel - [PATCH 5.5 010/120] RDMA/core: Ensure that rdma_user_mmap_entry

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Message-Id: <20200213151905.020233871@linuxfoundation.org>
Date:   Thu, 13 Feb 2020 07:20:06 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gal Pressman <galpress@...zon.com>,
        Michal Kalderon <michal.kalderon@...vell.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Subject: [PATCH 5.5 010/120] RDMA/core: Ensure that rdma_user_mmap_entry_remove() is a fence

From: Jason Gunthorpe <jgg@...lanox.com>

commit 6b3712c0246ca7b2b8fa05eab2362cf267410f7e 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: 3411f9f01b76 ("RDMA/core: Create mmap database and cookie helper functions")
Link: https://lore.kernel.org/r/20200115202041.GA17199@ziepe.ca
Reviewed-by: Gal Pressman <galpress@...zon.com>
Acked-by: Michal Kalderon <michal.kalderon@...vell.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/core/ib_core_uverbs.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/infiniband/core/ib_core_uverbs.c
+++ b/drivers/infiniband/core/ib_core_uverbs.c
@@ -232,7 +232,9 @@ void rdma_user_mmap_entry_remove(struct
 	if (!entry)
 		return;
 
+	xa_lock(&entry->ucontext->mmap_xa);
 	entry->driver_removed = true;
+	xa_unlock(&entry->ucontext->mmap_xa);
 	kref_put(&entry->ref, rdma_user_mmap_entry_free);
 }
 EXPORT_SYMBOL(rdma_user_mmap_entry_remove);