[PATCH AUTOSEL 5.4 338/459] RDMA/uverbs: Verify MR access flags

[Sasha Levin]

From: Michael Guralnik <michaelgur@xxxxxxxxxxxx>

[ Upstream commit ca95c1411198c2d87217c19d44571052cdc94725 ]

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@xxxxxxxxxxxx
Signed-off-by: Michael Guralnik <michaelgur@xxxxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 include/rdma/ib_verbs.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 633a2d3f2fd98..30d50528d710e 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -4255,6 +4255,9 @@ static inline int ib_check_mr_access(int flags)
 	    !(flags & IB_ACCESS_LOCAL_WRITE))
 		return -EINVAL;
 
+	if (flags & ~IB_ACCESS_SUPPORTED)
+		return -EINVAL;
+
 	return 0;
 }
 
-- 
2.20.1