[PATCH 5.4 164/282] RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

From: Dan Carpenter <error27@gmail.com>

[ Upstream commit d50b3c73f1ac20dabc53dc6e9d64ce9c79a331eb ]

The ucmd->log_sq_bb_count variable is controlled by the user so this
shift can wrap.  Fix it by using check_shl_overflow() in the same way
that it was done in commit 515f60004ed9 ("RDMA/hns: Prevent undefined
behavior in hns_roce_set_user_sq_size()").

Fixes: 839041329fd3 ("IB/mlx4: Sanity check userspace send queue sizes")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Link: https://lore.kernel.org/r/a8dfbd1d-c019-4556-930b-bab1ded73b10@kili.mountain
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/infiniband/hw/mlx4/qp.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index bca5358f3ef29..4523eb85ec698 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -438,9 +438,13 @@ static int set_user_sq_size(struct mlx4_ib_dev *dev,
 			    struct mlx4_ib_qp *qp,
 			    struct mlx4_ib_create_qp *ucmd)
 {
+	u32 cnt;
+
 	/* Sanity check SQ size before proceeding */
-	if ((1 << ucmd->log_sq_bb_count) > dev->dev->caps.max_wqes	 ||
-	    ucmd->log_sq_stride >
+	if (check_shl_overflow(1, ucmd->log_sq_bb_count, &cnt) ||
+	    cnt > dev->dev->caps.max_wqes)
+		return -EINVAL;
+	if (ucmd->log_sq_stride >
 		ilog2(roundup_pow_of_two(dev->dev->caps.max_sq_desc_sz)) ||
 	    ucmd->log_sq_stride < MLX4_IB_MIN_SQ_STRIDE)
 		return -EINVAL;
-- 
2.39.2