[PATCH] RDMA/mlx4: Make check for invalid flags stricter

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This code is trying to ensure that only the flags specified in the list
are allowed.  The problem is that ucmd->rx_hash_fields_mask is a u64 and
the flags are an enum which is treated as a u32 in this context.  That
means the test doesn't check whether the highest 32 bits are zero.

Fixes: 4d02ebd9bbbd ("IB/mlx4: Fix RSS hash fields restrictions")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
The MLX4_IB_RX_HASH_INNER value is declared as
"MLX4_IB_RX_HASH_INNER           = 1ULL << 31," which suggests that it
should be type ULL but that doesn't work.  It will still be basically a
u32.  (Enum types are weird).

 drivers/infiniband/hw/mlx4/qp.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 456656617c33..9d08aa99f3cb 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -565,15 +565,15 @@ static int set_qp_rss(struct mlx4_ib_dev *dev, struct mlx4_ib_rss *rss_ctx,
 		return (-EOPNOTSUPP);
 	}
 
-	if (ucmd->rx_hash_fields_mask & ~(MLX4_IB_RX_HASH_SRC_IPV4	|
-					  MLX4_IB_RX_HASH_DST_IPV4	|
-					  MLX4_IB_RX_HASH_SRC_IPV6	|
-					  MLX4_IB_RX_HASH_DST_IPV6	|
-					  MLX4_IB_RX_HASH_SRC_PORT_TCP	|
-					  MLX4_IB_RX_HASH_DST_PORT_TCP	|
-					  MLX4_IB_RX_HASH_SRC_PORT_UDP	|
-					  MLX4_IB_RX_HASH_DST_PORT_UDP  |
-					  MLX4_IB_RX_HASH_INNER)) {
+	if (ucmd->rx_hash_fields_mask & ~(u64)(MLX4_IB_RX_HASH_SRC_IPV4	|
+					       MLX4_IB_RX_HASH_DST_IPV4	|
+					       MLX4_IB_RX_HASH_SRC_IPV6	|
+					       MLX4_IB_RX_HASH_DST_IPV6	|
+					       MLX4_IB_RX_HASH_SRC_PORT_TCP |
+					       MLX4_IB_RX_HASH_DST_PORT_TCP |
+					       MLX4_IB_RX_HASH_SRC_PORT_UDP |
+					       MLX4_IB_RX_HASH_DST_PORT_UDP |
+					       MLX4_IB_RX_HASH_INNER)) {
 		pr_debug("RX Hash fields_mask has unsupported mask (0x%llx)\n",
 			 ucmd->rx_hash_fields_mask);
 		return (-EOPNOTSUPP);
-- 
2.39.2




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