From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Date: Tue, 28 Sep 2021 17:11:57 -0500
Subject: net/mlx5: Use struct_size() helper in kvzalloc()
Patch-mainline: v5.16-rc1
Git-commit: ab9ace34158f48e65024e21994ed83d065e2ce6e
References: jsc#SLE-19253

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@kernel.org>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/mellanox/mlx5/core/fs_counters.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- 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
 	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;