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

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Date:   Mon, 28 Feb 2022 23:16:00 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Roi Dayan <roid@...dia.com>
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        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 25 Feb 14:18, Roi Dayan wrote:
>
>
>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
>

Ok this one arrived first, will take this one :).
applied to net-next-mlx5.

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