[PATCH 4.18 147/350] RDMA/bnxt_re: Avoid accessing nq->bar_reg_iomem in failure case

[Greg Kroah-Hartman]

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

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

From: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>

[ Upstream commit ed51efd2ce44091a858ad829f666727e7c95695e ]

In the failure path, nq->bar_reg_iomem gets accessed without
initializing. Avoid this by calling the bnxt_qplib_nq_stop_irq only if the
initialization is complete.

Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: 1ac5a4047975 ("RDMA/bnxt_re: Add bnxt_re RoCE driver")
Fixes: 6e04b1035689 ("RDMA/bnxt_re: Fix broken RoCE driver due to recent L2 driver changes")
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/infiniband/hw/bnxt_re/qplib_fp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/hw/bnxt_re/qplib_fp.c
+++ b/drivers/infiniband/hw/bnxt_re/qplib_fp.c
@@ -360,7 +360,8 @@ void bnxt_qplib_disable_nq(struct bnxt_q
 	}
 
 	/* Make sure the HW is stopped! */
-	bnxt_qplib_nq_stop_irq(nq, true);
+	if (nq->requested)
+		bnxt_qplib_nq_stop_irq(nq, true);
 
 	if (nq->bar_reg_iomem)
 		iounmap(nq->bar_reg_iomem);