linux-kernel - [PATCH 1/2] RDMA/uverbs: Fix the check for port number

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Date:   Thu, 13 Jul 2017 14:37:37 -0500
From:   Mustafa Ismail <mustafa.ismail@...el.com>
To:     linux-rdma@...r.kernel.org
Cc:     dledford@...hat.com, swise@...ngridcomputing.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        gregkh@...uxfoundation.org, shiraz.saleem@...el.com
Subject: [PATCH 1/2] RDMA/uverbs: Fix the check for port number

The port number is only valid if IB_QP_PORT is set in the mask.
So only check port number if it is valid to prevent modify_qp from
failing due to an invalid port number.

Fixes: 5ecce4c9b17b("Check port number supplied by user verbs cmds")
Signed-off-by: Mustafa Ismail <mustafa.ismail@...el.com>
---
 drivers/infiniband/core/uverbs_cmd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 8ba9bfb..19de068 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1935,7 +1935,8 @@ static int modify_qp(struct ib_uverbs_file *file,
 		goto out;
 	}
 
-	if (!rdma_is_port_valid(qp->device, cmd->base.port_num)) {
+	if ((cmd->base.attr_mask & IB_QP_PORT) &&
+	    !rdma_is_port_valid(qp->device, cmd->base.port_num)) {
 		ret = -EINVAL;
 		goto release_qp;
 	}
-- 
2.7.4