linux-kernel - Re: [PATCH][next] drm/i915/hdcp: Fix return of value in uninitialized variable ret

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Date:   Fri, 22 Jan 2021 17:21:02 +0200
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Ramalingam C <ramalingam.c@...el.com>,
        Anshuman Gupta <anshuman.gupta@...el.com>,
        Uma Shankar <uma.shankar@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drm/i915/hdcp: Fix return of value in uninitialized variable ret

On Fri, 22 Jan 2021, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> Currently when there are other connectors on the port using HDCP the
> function _intel_hdcp_disable returns a garbage uninitialized value in
> variable ret.  I believe the intention is to return 0, so return this
> literal value instead of the value in ret.
>
> Addresses-Coverity: ("Uninitialized scalar return")
> Fixes: 899c8762f981 ("drm/i915/hdcp: Configure HDCP2.2 MST steram encryption status")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Thanks, but there's already a fix in progress:

http://lore.kernel.org/r/20210119064655.1605-3-anshuman.gupta@intel.com

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index db8dff2eeb0a..a0e7b0bf892b 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -883,7 +883,7 @@ static int _intel_hdcp_disable(struct intel_connector *connector)
>  	 * until it disabled HDCP encryption for all connectors in MST topology.
>  	 */
>  	if (dig_port->num_hdcp_streams > 0)
> -		return ret;
> +		return 0;
>  
>  	hdcp->hdcp_encrypted = false;
>  	intel_de_write(dev_priv, HDCP_CONF(dev_priv, cpu_transcoder, port), 0);

-- 
Jani Nikula, Intel Open Source Graphics Center