request for 4.14-stable: 940efcc8889f ("RDMA/uverbs: Protect from attempts to create flows on unsupported QP")

[Sudip Mukherjee <sudipm.mukherjee@gmail.com>]

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Hi Greg,

This was missing in 4.14-stable. Please apply to your queue.

--
Regards
Sudip

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>From 4c9252a8f092e69c9671109ede7090591dee2e8f Mon Sep 17 00:00:00 2001
From: Leon Romanovsky <leonro@mellanox.com>
Date: Sun, 24 Jun 2018 11:23:42 +0300
Subject: [PATCH] RDMA/uverbs: Protect from attempts to create flows on unsupported QP

commit 940efcc8889f0d15567eb07fc9fd69b06e366aa5 upstream

Flows can be created on UD and RAW_PACKET QP types. Attempts to provide
other QP types as an input causes to various unpredictable failures.

The reason is that in order to support all various types (e.g. XRC), we
are supposed to use real_qp handle and not qp handle and expect to
driver/FW to fail such (XRC) flows. The simpler and safer variant is to
ban all QP types except UD and RAW_PACKET, instead of relying on
driver/FW.

Cc: <stable@vger.kernel.org> # 3.11
Fixes: 436f2ad05a0b ("IB/core: Export ib_create/destroy_flow through uverbs")
Cc: syzkaller <syzkaller@googlegroups.com>
Reported-by: Noa Osherovich <noaos@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
---
 drivers/infiniband/core/uverbs_cmd.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 186dce6bba8f..b8229d7b0ff5 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -3376,6 +3376,11 @@ int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
 		goto err_uobj;
 	}
 
+	if (qp->qp_type != IB_QPT_UD && qp->qp_type != IB_QPT_RAW_PACKET) {
+		err = -EINVAL;
+		goto err_put;
+	}
+
 	flow_attr = kzalloc(sizeof(*flow_attr) + cmd.flow_attr.num_of_specs *
 			    sizeof(union ib_flow_spec), GFP_KERNEL);
 	if (!flow_attr) {
-- 
2.11.0