linux-kernel - Re: [PATCH] net/mlx5e: Fix slab-out-of-bounds in mlx5_query_nic_vport_mac

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Message-ID: <ZXDq-k8LU2ORTLAW@x130>
Date:   Wed, 6 Dec 2023 13:43:22 -0800
From:   Saeed Mahameed <saeed@...nel.org>
To:     Shifeng Li <lishifeng@...gfor.com.cn>
Cc:     saeedm@...dia.com, leon@...nel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        ogerlitz@...lanox.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        dinghui@...gfor.com.cn, lishifeng1992@....com
Subject: Re: [PATCH] net/mlx5e: Fix slab-out-of-bounds in
 mlx5_query_nic_vport_mac_list()

On 30 Nov 01:46, Shifeng Li wrote:
>Out_sz that the size of out buffer is calculated using query_nic_vport
>_context_in structure when driver query the MAC list. However query_nic
>_vport_context_in structure is smaller than query_nic_vport_context_out.
>When allowed_list_size is greater than 96, calling ether_addr_copy() will
>trigger an slab-out-of-bounds.
>
>[ 1170.055866] BUG: KASAN: slab-out-of-bounds in mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core]
>[ 1170.055869] Read of size 4 at addr ffff88bdbc57d912 by task kworker/u128:1/461
>[ 1170.055870]
>[ 1170.055932] Workqueue: mlx5_esw_wq esw_vport_change_handler [mlx5_core]
>[ 1170.055936] Call Trace:
>[ 1170.055949]  dump_stack+0x8b/0xbb
>[ 1170.055958]  print_address_description+0x6a/0x270
>[ 1170.055961]  kasan_report+0x179/0x2c0
>[ 1170.056061]  mlx5_query_nic_vport_mac_list+0x481/0x4d0 [mlx5_core]
>[ 1170.056162]  esw_update_vport_addr_list+0x2c5/0xcd0 [mlx5_core]
>[ 1170.056257]  esw_vport_change_handle_locked+0xd08/0x1a20 [mlx5_core]
>[ 1170.056377]  esw_vport_change_handler+0x6b/0x90 [mlx5_core]
>[ 1170.056381]  process_one_work+0x65f/0x12d0
>[ 1170.056383]  worker_thread+0x87/0xb50
>[ 1170.056390]  kthread+0x2e9/0x3a0
>[ 1170.056394]  ret_from_fork+0x1f/0x40
>
>Fixes: e16aea2744ab ("net/mlx5: Introduce access functions to modify/query vport mac lists")
>Cc: Ding Hui <dinghui@...gfor.com.cn>
>Signed-off-by: Shifeng Li <lishifeng@...gfor.com.cn>

Applied to net-mlx5. 

Thanks,
Saeed.