Re: [PATCH v3 2/4] misc: fastrpc: Fix fastrpc_map_lookup operation

[Dmitry Baryshkov]

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@xxxxxxxxxx
> Co-developed-by: Ekansh Gupta <ekansh.gupta@xxxxxxxxxxxxxxxx>
> Signed-off-by: Ekansh Gupta <ekansh.gupta@xxxxxxxxxxxxxxxx>
> Signed-off-by: Ling Xu <quic_lxu5@xxxxxxxxxxx>
> ---
>  drivers/misc/fastrpc.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 

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


-- 
With best wishes
Dmitry