Re: [PATCH net 3/3] net: hns3: add VLAN id validation before using

[Jijie Shao]

on 2025/12/10 0:50, Simon Horman wrote:
> On Tue, Dec 09, 2025 at 09:38:25PM +0800, Jijie Shao wrote:
> > From: Jian Shen <shenjian15@xxxxxxxxxx>
> >
> > Currently, the VLAN id may be used without validation when
> > receive a VLAN configuration mailbox from VF. It may cause
> > out-of-bounds memory access once the VLAN id is bigger than
> > 4095.
> >
> > Fixes: fe4144d47eef ("net: hns3: sync VLAN filter entries when kill VLAN ID failed")
> > Signed-off-by: Jian Shen <shenjian15@xxxxxxxxxx>
> > Signed-off-by: Jijie Shao <shaojijie@xxxxxxxxxx>
> Hi Jijie,
>
> Can you clarify that the (only) oob access is to vlan_del_fail_bmap?
>
> If so, I agree with this change and that the problem was introduced in
> the cited commit. But I think it would be worth mentioning vlan_del_fail_bmap
> in the commit message.
Yes, the length of vlan_del_fail_bmap is BITS_TO_LONGS(VLAN_N_VID).
Therefore, vlan_id needs to be checked to ensure it is within the range of VLAN_N_VID.

I will add this in V2

Thanks,
Jijie Shao


> ...