netdev - Re: [PATCH] net/mlx5e: TC, Fix use after free in mlx5e_clone_flow_attr_for_post

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Date:   Fri, 25 Feb 2022 14:18:44 +0200
From:   Roi Dayan <roid@...dia.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Saeed Mahameed <saeedm@...dia.com>
CC:     Leon Romanovsky <leon@...nel.org>, <netdev@...r.kernel.org>,
        <linux-rdma@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] net/mlx5e: TC, Fix use after free in
 mlx5e_clone_flow_attr_for_post_act()



On 2022-02-24 4:53 PM, Dan Carpenter wrote:
> This returns freed memory leading to a use after free.  It's supposed to
> return NULL.
> 
> Fixes: 8300f225268b ("net/mlx5e: Create new flow attr for multi table actions")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> This goes through Saeed's tree not the net tree.
> 
>   drivers/net/ethernet/mellanox/mlx5/core/en_tc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> index 76a015dfc5fc..c0776a4a3845 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_tc.c
> @@ -3398,7 +3398,7 @@ mlx5e_clone_flow_attr_for_post_act(struct mlx5_flow_attr *attr,
>   	if (!attr2 || !parse_attr) {
>   		kvfree(parse_attr);
>   		kfree(attr2);
> -		return attr2;
> +		return NULL;
>   	}
>   
>   	memcpy(attr2, attr, attr_sz);

hi, I noticed your fix now and already reviewed same fix from Colin

https://patchwork.kernel.org/project/netdevbpf/patch/20220224221525.147744-1-colin.i.king@gmail.com/

so just need to take either one.
thanks

Reviewed-by: Roi Dayan <roid@...dia.com>