linux-kernel - Re: [PATCH v3 2/4] misc: fastrpc: Fix fastrpc_map

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Message-ID: <nmipsdulp2roagr5g2emrijonc4xkupoqm3vdelaiihy547qlk@yvg4qmg2qgwj>
Date: Thu, 14 Aug 2025 10:04:41 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Ling Xu <quic_lxu5@...cinc.com>
Cc: srini@...nel.org, amahesh@....qualcomm.com, arnd@...db.de,
        gregkh@...uxfoundation.org, sumit.semwal@...aro.org,
        christian.koenig@....com, thierry.escande@...aro.org,
        quic_vgattupa@...cinc.com, quic_kuiw@...cinc.com,
        ekansh.gupta@....qualcomm.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org,
        stable@...nel.org
Subject: Re: [PATCH v3 2/4] misc: fastrpc: Fix fastrpc_map_lookup operation

On Thu, Aug 07, 2025 at 03:34:18PM +0530, Ling Xu wrote:
> Fastrpc driver creates maps for user allocated fd buffers. Before
> creating a new map, the map list is checked for any already existing
> maps using map fd. Checking with just map fd is not sufficient as the
> user can pass offsetted buffer with less size when the map is created
> and then a larger size the next time which could result in memory
> issues. Check for dma_buf object also when looking up for the map.
> 
> Fixes: c68cfb718c8f ("misc: fastrpc: Add support for context Invoke method")
> Cc: stable@...nel.org
> Co-developed-by: Ekansh Gupta <ekansh.gupta@....qualcomm.com>
> Signed-off-by: Ekansh Gupta <ekansh.gupta@....qualcomm.com>
> Signed-off-by: Ling Xu <quic_lxu5@...cinc.com>
> ---
>  drivers/misc/fastrpc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>


-- 
With best wishes
Dmitry