netdev - [PATCH net-next 05/16] net/mlx5: Add MLX5_FLEXIBLE

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Date:   Thu, 29 Sep 2022 00:21:45 -0700
From:   Saeed Mahameed <saeed@...nel.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     Saeed Mahameed <saeedm@...dia.com>, netdev@...r.kernel.org,
        Tariq Toukan <tariqt@...dia.com>,
        Maxim Mikityanskiy <maximmi@...dia.com>
Subject: [PATCH net-next 05/16] net/mlx5: Add MLX5_FLEXIBLE_INLEN to safely calculate cmd inlen

From: Maxim Mikityanskiy <maximmi@...dia.com>

Some commands use a flexible array after a common header. Add a macro to
safely calculate the total input length of the command, detecting
overflows and printing errors with specific values when such overflows
happen.

Signed-off-by: Maxim Mikityanskiy <maximmi@...dia.com>
Reviewed-by: Tariq Toukan <tariqt@...dia.com>
Signed-off-by: Saeed Mahameed <saeedm@...dia.com>
---
 .../ethernet/mellanox/mlx5/core/mlx5_core.h   | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index ad61b86d5769..a806e3de7b7c 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -143,6 +143,36 @@ enum mlx5_semaphore_space_address {
 
 #define MLX5_DEFAULT_PROF       2
 
+static inline int mlx5_flexible_inlen(struct mlx5_core_dev *dev, size_t fixed,
+				      size_t item_size, size_t num_items,
+				      const char *func, int line)
+{
+	int inlen;
+
+	if (fixed > INT_MAX || item_size > INT_MAX || num_items > INT_MAX) {
+		mlx5_core_err(dev, "%s: %s:%d: input values too big: %zu + %zu * %zu\n",
+			      __func__, func, line, fixed, item_size, num_items);
+		return -ENOMEM;
+	}
+
+	if (check_mul_overflow((int)item_size, (int)num_items, &inlen)) {
+		mlx5_core_err(dev, "%s: %s:%d: multiplication overflow: %zu + %zu * %zu\n",
+			      __func__, func, line, fixed, item_size, num_items);
+		return -ENOMEM;
+	}
+
+	if (check_add_overflow((int)fixed, inlen, &inlen)) {
+		mlx5_core_err(dev, "%s: %s:%d: addition overflow: %zu + %zu * %zu\n",
+			      __func__, func, line, fixed, item_size, num_items);
+		return -ENOMEM;
+	}
+
+	return inlen;
+}
+
+#define MLX5_FLEXIBLE_INLEN(dev, fixed, item_size, num_items) \
+	mlx5_flexible_inlen(dev, fixed, item_size, num_items, __func__, __LINE__)
+
 int mlx5_query_hca_caps(struct mlx5_core_dev *dev);
 int mlx5_query_board_id(struct mlx5_core_dev *dev);
 int mlx5_cmd_init(struct mlx5_core_dev *dev);
-- 
2.37.3