linux-kernel - [PATCH 4.4 52/97] RDMA/ucma: Dont allow setting RDMA_OPTION_IB

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Date:   Sun, 22 Apr 2018 15:53:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+a67bc93e14682d92fc2f@...kaller.appspotmail.com,
        Roland Dreier <roland@...estorage.com>,
        Jason Gunthorpe <jgg@...lanox.com>
Subject: [PATCH 4.4 52/97] RDMA/ucma: Dont allow setting RDMA_OPTION_IB_PATH without an RDMA device

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Roland Dreier <roland@...estorage.com>

commit 8435168d50e66fa5eae01852769d20a36f9e5e83 upstream.

Check to make sure that ctx->cm_id->device is set before we use it.
Otherwise userspace can trigger a NULL dereference by doing
RDMA_USER_CM_CMD_SET_OPTION on an ID that is not bound to a device.

Cc: <stable@...r.kernel.org>
Reported-by: <syzbot+a67bc93e14682d92fc2f@...kaller.appspotmail.com>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Jason Gunthorpe <jgg@...lanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/infiniband/core/ucma.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1230,6 +1230,9 @@ static int ucma_set_ib_path(struct ucma_
 	if (!optlen)
 		return -EINVAL;
 
+	if (!ctx->cm_id->device)
+		return -EINVAL;
+
 	memset(&sa_path, 0, sizeof(sa_path));
 
 	ib_sa_unpack_path(path_data->path_rec, &sa_path);