linux-hardening - [PATCH][net-next] net/mlx5: Use struct

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Date:   Tue, 28 Sep 2021 17:11:57 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][net-next] net/mlx5: Use struct_size() helper in kvzalloc()

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worse scenario, could lead to heap overflows.

Link: https://github.com/KSPP/linux/issues/160
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
index 18e5aec14641..f542a36be62c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c
@@ -497,8 +497,7 @@ static struct mlx5_fc_bulk *mlx5_fc_bulk_create(struct mlx5_core_dev *dev)
 	alloc_bitmask = MLX5_CAP_GEN(dev, flow_counter_bulk_alloc);
 	bulk_len = alloc_bitmask > 0 ? MLX5_FC_BULK_NUM_FCS(alloc_bitmask) : 1;
 
-	bulk = kvzalloc(sizeof(*bulk) + bulk_len * sizeof(struct mlx5_fc),
-			GFP_KERNEL);
+	bulk = kvzalloc(struct_size(bulk, fcs, bulk_len), GFP_KERNEL);
 	if (!bulk)
 		goto err_alloc_bulk;
 
-- 
2.27.0