On Mon, Feb 12, 2018 at 02:51:42PM -0500, Joe Moriarty wrote:
> The Parfait (version 2.1.0) static code analysis tool found the
> following NULL pointer derefernce problem.
>
> - drivers/gpu/drm/drm_dp_mst_topology.c
> The call to drm_dp_calculate_rad() in function drm_dp_port_setup_pdt()
> could result in a NULL pointer being returned to port->mstb due to a
> failure to allocate memory for port->mstb.
>
> Signed-off-by: Joe Moriarty <joe.moriarty@xxxxxxxxxx>
> Reviewed-by: Steven Sistare <steven.sistare@xxxxxxxxxx>
Small allocations don't fail, so just pushed to drm-misc-next, not -fixes.
Thanks, Daniel
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 70dcfa58d3c2..ec503d416062 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -1082,10 +1082,12 @@ static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port)
> lct = drm_dp_calculate_rad(port, rad);
>
> port->mstb = drm_dp_add_mst_branch_device(lct, rad);
> - port->mstb->mgr = port->mgr;
> - port->mstb->port_parent = port;
> + if (port->mstb) {
> + port->mstb->mgr = port->mgr;
> + port->mstb->port_parent = port;
>
> - send_link = true;
> + send_link = true;
> + }
> break;
> }
> return send_link;
> --
> 2.15.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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