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

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Message-ID: <20171031194252.GA21223@kroah.com>
Date:   Tue, 31 Oct 2017 20:42:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
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" <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

On Tue, Oct 31, 2017 at 06:10:00PM +0000, Long Li wrote:
> > 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.

Sending on behalf means you should add your signed-off-by, as it is
going through you.

thanks,

greg k-h