netdev - Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in fs_udp_create

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Date: Tue, 28 Nov 2023 11:55:07 +0200
From: Tariq Toukan <ttoukan.linux@...il.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>,
 Zhengchao Shao <shaozhengchao@...wei.com>, Simon Horman <horms@...nel.org>,
 Rahul Rameshbabu <rrameshbabu@...dia.com>, Aya Levin <ayal@...dia.com>,
 Tariq Toukan <tariqt@...dia.com>, netdev@...r.kernel.org,
 linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
 Tariq Toukan <tariqt@...dia.com>
Subject: Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in
 fs_udp_create_groups

On 28/11/2023 11:40, Dinghao Liu wrote:
> When kcalloc() for ft->g succeeds but kvzalloc() for in fails,
> fs_udp_create_groups() will free ft->g. However, its caller
> fs_udp_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_udp_create_groups().
> 
> Fixes: 1c80bd684388 ("net/mlx5e: Introduce Flow Steering UDP 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..e1283531e0b8 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
> @@ -154,6 +154,7 @@ static int fs_udp_create_groups(struct mlx5e_flow_table *ft, enum fs_udp_type ty
>   	in = kvzalloc(inlen, GFP_KERNEL);
>   	if  (!in || !ft->g) {
>   		kfree(ft->g);
> +		ft->g = NULL;
>   		kvfree(in);
>   		return -ENOMEM;
>   	}

Thanks for your patch.
Reviewed-by: Tariq Toukan <tariqt@...dia.com>