linux-kernel - Re: [PATCH v4] infiniband: i40iw: fix a potential NULL pointer dereference

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Date:   Fri, 3 Jan 2020 20:01:28 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Xiyu Yang <xiyuyang19@...an.edu.cn>
Cc:     yuanxzhang@...an.edu.cn, kjlu@....edu, leon@...nel.org,
        Markus.Elfring@....de, Xin Tan <tanxin.ctf@...il.com>,
        Faisal Latif <faisal.latif@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Shannon Nelson <shannon.nelson@...el.com>,
        Anjali Singhai Jain <anjali.singhai@...el.com>,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] infiniband: i40iw: fix a potential NULL pointer
 dereference

On Mon, Dec 30, 2019 at 10:24:28AM +0800, Xiyu Yang wrote:
> A NULL pointer can be returned by in_dev_get(). Thus add
> a corresponding check so that a NULL pointer dereference
> will be avoided at this place.
> 
> Fixes: 8e06af711bf2 ("i40iw: add main, hdr, status")
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
> Reviewed-by: Leon Romanovsky <leonro@...lanox.com>
> ---
> Changes in v2:
> - Release rtnl lock when in_dev_get return NULL
> Changes in v3:
> - Continue the next loop when in_dev_get return NULL
> Changes in v4:
> - Change commit message
> 
>  drivers/infiniband/hw/i40iw/i40iw_main.c | 2 ++
>  1 file changed, 2 insertions(+)

Applied to for-next

And Shiraz, Leon is right, that trylock stuff is completely wrong,
let's fix it.

Jason