linux-kernel - Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_any_create

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Message-ID: <b7300fbb-41b5-4a30-b086-a8dde8ede207@nvidia.com>
Date:   Tue, 28 Nov 2023 14:53:33 +0200
From:   Tariq Toukan <tariqt@...dia.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     Saeed Mahameed <saeedm@...dia.com>,
        Leon Romanovsky <leon@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rahul Rameshbabu <rrameshbabu@...dia.com>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        Simon Horman <horms@...nel.org>, Aya Levin <ayal@...dia.com>,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in
 fs_any_create_groups



On 28/11/2023 11:29, Dinghao Liu wrote:
> When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
> fs_any_create_groups() will free ft->g. However, its caller
> fs_any_create_table() will free ft->g again through calling
> mlx5e_destroy_flow_table(), which will lead to a double-free.
> Fix this by setting ft->g to NULL in fs_any_create_groups().
> 
> Fixes: 0f575c20bf06 ("net/mlx5e: Introduce Flow Steering ANY API")
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
> 
> Changelog:
> 
> v2: Setting ft->g to NULL instead of removing the kfree().
> ---
>   drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> index be83ad9db82a..6207ffe74233 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/fs_tt_redirect.c
> @@ -435,6 +435,7 @@ static int fs_any_create_groups(struct mlx5e_flow_table *ft)
>   	in = kvzalloc(inlen, GFP_KERNEL);
>   	if  (!in || !ft->g) {
>   		kfree(ft->g);
> +		ft->g = NULL;
>   		kvfree(in);
>   		return -ENOMEM;
>   	}

Reviewed-by: Tariq Toukan <tariqt@...dia.com>