linux-kernel - Re: IB/hfi1: Use memdup_user() rather than duplicating its implementation in hfi1_user_sdma_process

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Date:   Mon, 13 Feb 2017 17:01:56 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:     linux-rdma@...r.kernel.org,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Sean Hefty <sean.hefty@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: IB/hfi1: Use memdup_user() rather than duplicating its
 implementation in hfi1_user_sdma_process_request()

On Mon, Feb 13, 2017 at 12:12:51PM +0100, SF Markus Elfring wrote:
> >> Thanks for the patch, but this one is already taken care of along
> >> with other similar uses of kmalloc/copy:
> >>
> >> http://marc.info/?l=linux-rdma&m=148656088729538&w=2
> >>
> > 
> > Michael's patch doesn't change user_sdma_free_request() so it introduces
> > a kfreeing an error pointer bug.
> 
> Did you notice that another local variable “tmp” was introduced in the update step
> “[PATCH 27/27] IB/hfi1: Code reuse with memdup_copy” so that
> the mentioned function will usually get a null pointer after a failure there?
> 

Ah right.  Thanks.  I missed that.

regards,
dan carpenter