linux-kernel - Re: Potential NULL pointer deference in RDMA

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Date:   Thu, 10 Oct 2019 09:51:07 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Yizhuo Zhai <yzhai003@....edu>
Cc:     Moni Shoua <monis@...lanox.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zhiyun Qian <zhiyunq@...ucr.edu>,
        Chengyu Song <csong@...ucr.edu>
Subject: Re: Potential NULL pointer deference in RDMA

On Wed, Oct 09, 2019 at 09:44:58PM -0700, Yizhuo Zhai wrote:
> Hi All:
> drivers/infiniband/sw/rxe/rxe_verbs.c:
> The function to_rdev() could return NULL, but no caller in this file
> checks the return value but directly dereference them, which seems
> potentially unsafe. Callers include rxe_query_device(),
> rxe_query_port(), rxe_query_pkey(), etc.


All NULL returns in to_r*() function are useless and can be removed.

Thanks
>
>
> --
> Kind Regards,
>
> Yizhuo Zhai
>
> Computer Science, Graduate Student
> University of California, Riverside