linux-kernel - Re: [PATCH] net/mlx5: Fix a memory leak bug

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Date:   Mon, 19 Aug 2019 16:00:53 +0300
From:   Moshe Shemesh <moshes20.il@...il.com>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:MELLANOX MLX5 core VPI driver" <netdev@...r.kernel.org>,
        "open list:MELLANOX MLX5 core VPI driver" 
        <linux-rdma@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net/mlx5: Fix a memory leak bug

Please don't change that.
On command timeout we don't release ent, since the FW event on
completion can occur after timeout, so it is released on the
completion handler mlx5_cmd_comp_handler().
See commit 73dd3a4839c1d ("net/mlx5: Avoid using pending command
interface slots").

On Tue, Aug 13, 2019 at 11:22 AM Wenwen Wang <wenwen@...uga.edu> wrote:
>
> In mlx5_cmd_invoke(), 'ent' is allocated through kzalloc() in alloc_cmd().
> After the work is queued, wait_func() is invoked to wait the completion of
> the work. If wait_func() returns -ETIMEDOUT, the following execution will
> be terminated. However, the allocated 'ent' is not deallocated on this
> program path, leading to a memory leak bug.
>
> To fix the above issue, free 'ent' before returning the error.
>
> Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/cmd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
> index 8cdd7e6..90cdb9a 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
> @@ -1036,7 +1036,7 @@ static int mlx5_cmd_invoke(struct mlx5_core_dev *dev, struct mlx5_cmd_msg *in,
>
>         err = wait_func(dev, ent);
>         if (err == -ETIMEDOUT)
> -               goto out;
> +               goto out_free;
>
>         ds = ent->ts2 - ent->ts1;
>         op = MLX5_GET(mbox_in, in->first.data, opcode);
> --
> 2.7.4
>