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SubjectRe: [PATCH] drm/bridge: ti-sn65dsi83: Fix null pointer dereference in remove callback
Hi Jonathan,

Thank you for the patch.

On Thu, Jun 17, 2021 at 09:19:25PM +1000, Jonathan Liu wrote:
> If attach has not been called, unloading the driver can result in a null
> pointer dereference in mipi_dsi_detach as ctx->dsi has not been assigned
> yet.

Shouldn't this be done in a brige .detach() operation instead ?

> Fixes: ceb515ba29ba6b ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver")
> Signed-off-by: Jonathan Liu <net147@gmail.com>
> ---
> drivers/gpu/drm/bridge/ti-sn65dsi83.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> index 750f2172ef08..8e9f45c5c7c1 100644
> --- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
> @@ -671,8 +671,11 @@ static int sn65dsi83_remove(struct i2c_client *client)
> {
> struct sn65dsi83 *ctx = i2c_get_clientdata(client);
>
> - mipi_dsi_detach(ctx->dsi);
> - mipi_dsi_device_unregister(ctx->dsi);
> + if (ctx->dsi) {
> + mipi_dsi_detach(ctx->dsi);
> + mipi_dsi_device_unregister(ctx->dsi);
> + }
> +
> drm_bridge_remove(&ctx->bridge);
> of_node_put(ctx->host_node);
>

--
Regards,

Laurent Pinchart

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