Subject: Re: [PATCH net v2] net: vlan: fix a UAF in vlan_dev_real_dev()

From: [email-masked]
Date: Wed, 03 Nov 2021 14:30:07 +0000

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <[email-masked]>:

On Tue, 2 Nov 2021 10:12:18 +0800 you wrote:
> The real_dev of a vlan net_device may be freed after
> unregister_vlan_dev(). Access the real_dev continually by
> vlan_dev_real_dev() will trigger the UAF problem for the
> real_dev like following:
> 
> ==================================================================
> BUG: KASAN: use-after-free in vlan_dev_real_dev+0xf9/0x120
> Call Trace:
>  kasan_report.cold+0x83/0xdf
>  vlan_dev_real_dev+0xf9/0x120
>  is_eth_port_of_netdev_filter.part.0+0xb1/0x2c0
>  is_eth_port_of_netdev_filter+0x28/0x40
>  ib_enum_roce_netdev+0x1a3/0x300
>  ib_enum_all_roce_netdevs+0xc7/0x140
>  netdevice_event_work_handler+0x9d/0x210
> ...
> 
> [...]

Here is the summary with links:
  - [net,v2] net: vlan: fix a UAF in vlan_dev_real_dev()
    https://git.kernel.org/netdev/net/c/563bcbae3ba2

You are awesome, thank you!
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