linux-kernel - RE: [PATCH] hv: kvp: Avoid reading past allocated blocks from KVP file

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Date:   Tue, 31 Oct 2017 18:10:00 +0000
From:   Long Li <longli@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Meyer <Paul.Meyer@...rosoft.com>
Subject: RE: [PATCH] hv: kvp: Avoid reading past allocated blocks from KVP
 file

> From: Greg KH [mailto:gregkh@...uxfoundation.org]
> Sent: Tuesday, October 31, 2017 1:43 AM
> To: Long Li <longli@...rosoft.com>
> Cc: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> devel@...uxdriverproject.org; linux-kernel@...r.kernel.org; Paul Meyer
> <Paul.Meyer@...rosoft.com>
> Subject: Re: [PATCH] hv: kvp: Avoid reading past allocated blocks from KVP file
> 
> On Mon, Oct 30, 2017 at 05:08:03PM -0700, Long Li wrote:
> > From: Paul Meyer <Paul.Meyer@...rosoft.com>
> >
> > While reading in more than one block (50) of KVP records, the
> > allocation goes per block, but the reads used the total number of
> > allocated records (without resetting the pointer/stream). This causes
> > the records buffer to overrun when the refresh reads more than one
> > block over the previous capacity (e.g. reading more than 100 KVP records
> whereas the in-memory database was empty before).
> 
> Please wrap changelogs at 72 columns like your editor asked you to...

I will fix it.

> 
> >
> > Fix this by reading the correct number of KVP records from file each time.
> >
> > Signed-off-by: Paul Meyer <Paul.Meyer@...rosoft.com>
> > ---
> 
> Why is your name not also on the signed-off-by chain if you are forwarding on a
> patch from someone else?
> 
> Is this patch also needed on stable kernels?

I'm sending on behalf of Paul Meyer. I will add a "Reviewed-by:" tag.

Yes it should also go stable. Will send v2 to include that.

> 
> thanks,
> 
> greg k-h