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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Michael Guralnik <michaelgur@mellanox.com>,
        Yishai Hadas <yishaih@mellanox.com>,
        Jason Gunthorpe <jgg@mellanox.com>
Subject: [PATCH 4.19 06/52] RDMA/uverbs: Verify MR access flags
Date:   Thu, 13 Feb 2020 07:20:47 -0800
Message-Id: <20200213151813.270748287@linuxfoundation.org>
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From: Michael Guralnik <michaelgur@mellanox.com>

commit ca95c1411198c2d87217c19d44571052cdc94725 upstream.

Verify that MR access flags that are passed from user are all supported
ones, otherwise an error is returned.

Fixes: 4fca03778351 ("IB/uverbs: Move ib_access_flags and ib_read_counters_flags to uapi")
Link: https://lore.kernel.org/r/1578506740-22188-6-git-send-email-yishaih@mellanox.com
Signed-off-by: Michael Guralnik <michaelgur@mellanox.com>
Signed-off-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/rdma/ib_verbs.h |    3 +++
 1 file changed, 3 insertions(+)

--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -3864,6 +3864,9 @@ static inline int ib_check_mr_access(int
 	    !(flags & IB_ACCESS_LOCAL_WRITE))
 		return -EINVAL;
 
+	if (flags & ~IB_ACCESS_SUPPORTED)
+		return -EINVAL;
+
 	return 0;
 }