Re: [PATCH] drm/nouveau: Fix refcount leak in nouveau_connector_detect

[Lyude Paul <lyude@redhat.com>]

With the changes that Danilo mentioned:

Reviewed-by: Lyude Paul <lyude@redhat.com>

On Tue, 2025-10-07 at 00:48 +0800, Shuhao Fu wrote:
> A possible inconsistent refcount update has been identified in function
> `nouveau_connector_detect`, which may cause a resource leak.
> 
> After calling `pm_runtime_get_*(dev->dev)`, the usage counter of `dev->dev`
> gets increased. In case function `nvif_outp_edid_get` returns negative,
> function `nouveau_connector_detect` returns without decreasing the usage
> counter of `dev->dev`, causing a refcount inconsistency.
> 
> Signed-off-by: Shuhao Fu <sfual@cse.ust.hk>
> Closes: https://gitlab.freedesktop.org/drm/nouveau/-/issues/450
> ---
>  drivers/gpu/drm/nouveau/nouveau_connector.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 63621b151..45caccade 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -600,8 +600,10 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
>  				new_edid = drm_get_edid(connector, nv_encoder->i2c);
>  		} else {
>  			ret = nvif_outp_edid_get(&nv_encoder->outp, (u8 **)&new_edid);
> -			if (ret < 0)
> -				return connector_status_disconnected;
> +			if (ret < 0) {
> +				conn_status = connector_status_disconnected;
> +				goto out;
> +			}
>  		}
>  
>  		nouveau_connector_set_edid(nv_connector, new_edid);

-- 
Cheers,
 Lyude Paul (she/her)
 Senior Software Engineer at Red Hat

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