[PATCH 3.18.y] IB/mlx5: Fix leaking stack memory to userspace

[Alessio Balsini]

From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>

mlx5_ib_create_qp_resp was never initialized and only the first 4 bytes
were written.

Fixes: 41d902cb7c32 ("RDMA/mlx5: Fix definition of mlx5_ib_create_qp_resp")
Cc: <stable@xxxxxxxxxxxxxxx>
Acked-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Signed-off-by: Alessio Balsini <balsini@xxxxxxxxxxx>
---
 drivers/infiniband/hw/mlx5/qp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 5edb09e674a6..82c4e29c1213 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -811,7 +811,7 @@ static int create_qp_common(struct mlx5_ib_dev *dev, struct ib_pd *pd,
 			    struct ib_udata *udata, struct mlx5_ib_qp *qp)
 {
 	struct mlx5_ib_resources *devr = &dev->devr;
-	struct mlx5_ib_create_qp_resp resp;
+	struct mlx5_ib_create_qp_resp resp = {};
 	struct mlx5_create_qp_mbox_in *in;
 	struct mlx5_general_caps *gen;
 	struct mlx5_ib_create_qp ucmd;
-- 
2.23.0.rc1.153.gdeed80330f-goog