linux-kernel - [PATCH 5.5 008/120] RDMA/uverbs: Verify MR access flags

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Date:   Thu, 13 Feb 2020 07:20:04 -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, Michael Guralnik <michaelgur@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Subject: [PATCH 5.5 008/120] RDMA/uverbs: Verify MR access flags

From: Michael Guralnik <michaelgur@...lanox.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@...lanox.com>
Signed-off-by: Yishai Hadas <yishaih@...lanox.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4300,6 +4300,9 @@ static inline int ib_check_mr_access(int
 	    !(flags & IB_ACCESS_LOCAL_WRITE))
 		return -EINVAL;
 
+	if (flags & ~IB_ACCESS_SUPPORTED)
+		return -EINVAL;
+
 	return 0;
 }