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

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Message-ID: <20231130174538.GK32077@kernel.org>
Date:   Thu, 30 Nov 2023 17:45:38 +0000
From:   Simon Horman <horms@...nel.org>
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>,
        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
Subject: Re: [PATCH] [v2] net/mlx5e: fix a potential double-free in
 fs_udp_create_groups

On Tue, Nov 28, 2023 at 05:40:53PM +0800, 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().

Reviewed-by: Simon Horman <horms@...nel.org>