linux-kernel - RE: [PATCH] scsi: storvsc: Use kzfree() in storvsc

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Date:   Thu, 4 Jun 2020 21:49:31 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "efremov@...ux.com" <efremov@...ux.com>,
        Dexuan-Linux Cui <dexuan.linux@...il.com>,
        Michael Kelley <mikelley@...rosoft.com>
CC:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Linux SCSI List <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi: storvsc: Use kzfree() in storvsc_suspend()

> From: Denis Efremov <efremov@...ux.com>
> Sent: Thursday, June 4, 2020 2:43 PM
> >
> > Hi Denis,
> > When I added the function storvsc_suspend() several months ago, somehow
> > I forgot to remove the unnecessary memset(). Sorry!
> >
> > The buffer is recreated in storvsc_resume() -> storvsc_connect_to_vsp() ->
> > storvsc_channel_init() -> stor_device->stor_chns = kcalloc(...), so I believe
> > the memset() can be safely removed.
> 
> I'm not sure that I understand your description. As for me, memset with 0
> before
> memory freeing is required only for sensitive information and it's completely
> unrelated to memory zeroing during allocation with kzalloc/kcalloc.
> If it's not a sensitive information then memset could be safely removed.

There is no sensitive info in the buffer here.

> > Can you please make a v2 patch for it and Cc my corporate email "decui" (in
> To)?
> 
> Yes, of course. Could I add "Suggested-by"?
> 
> Thanks,
> Denis

Sure. 

Thanks,
-- Dexuan