linux-kernel - Re: [PATCH] misc: fastrpc: fix improper packet size calculation

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Message-ID: <YUhYcFgMQ8AwB4vj@kroah.com>
Date:   Mon, 20 Sep 2021 11:46:24 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     jeyr@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org, srinivas.kandagatla@...aro.org,
        linux-kernel@...r.kernel.org, fastrpc.upstream@....qualcomm.com
Subject: Re: [PATCH] misc: fastrpc: fix improper packet size calculation

On Mon, Sep 20, 2021 at 03:01:07PM +0530, jeyr@...eaurora.org wrote:
> On 2021-09-20 14:38, Greg KH wrote:
> > On Mon, Sep 20, 2021 at 01:45:31PM +0530, Jeya R wrote:
> > > The buffer list is sorted and this is not being
> > > considered while calculating packet size. This
> > > would lead to improper copy length calculation
> > > for non-dmaheap buffers which would eventually
> > > cause sending improper buffers to DSP.
> > 
> > You do have the full 72 columns to use :)
> 
> Thanks, will update the commit message considering this.
> 
> > 
> > > 
> > > Signed-off-by: Jeya R <jeyr@...eaurora.org>
> > > ---
> > >  drivers/misc/fastrpc.c | 13 +++++++++----
> > >  1 file changed, 9 insertions(+), 4 deletions(-)
> > 
> > What commit does this fix?
> > 
> > thanks,
> > 
> > greg k-h
> 
> Payload calculation function was modified to handle buffer overlapping
> calculation in this commit:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/misc/fastrpc.c?h=v5.15-rc2&id=25e8dfb83cda0a123bb1e091d6c3599cde050d76
> 
> Here during buffer overlap calculation, the buffer list is getting sorted.
> This needs to be considered during the calculation of payload size also by
> using unsorted buffer index "raix".

Ok, then please add a "Fixes:" tag when you resend this.

thanks,

greg k-h