linux-kernel - Re: [PATCH] drm/gma500: fix memory leak on edid

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Date:   Mon, 20 Mar 2017 19:30:43 +0100
From:   walter harms <wharms@....de>
To:     Colin King <colin.king@...onical.com>
CC:     Patrik Jakobsson <patrik.r.jakobsson@...il.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/gma500: fix memory leak on edid



Am 20.03.2017 18:56, schrieb Colin King:
> From: Colin Ian King <colin.king@...onical.com>
> 
> edid is allocated on the call to psb_intel_sdvo_get_edid but not
> kfree'd at all, causing a memory leak.  Fix this by kfree'ing
> the edid.  (This may be null, but kfree can handle null frees).
> 
> Detected by CoverityScan, CID#1090730 ("Resource Leak")
> 
> Fixes: 5736995b473b ("gma500: Replace SDVO code with slightly modified version from i915")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/gpu/drm/gma500/psb_intel_sdvo.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/gma500/psb_intel_sdvo.c b/drivers/gpu/drm/gma500/psb_intel_sdvo.c
> index e787d376ba67..f38e6ad1ab9b 100644
> --- a/drivers/gpu/drm/gma500/psb_intel_sdvo.c
> +++ b/drivers/gpu/drm/gma500/psb_intel_sdvo.c
> @@ -1650,6 +1650,7 @@ static bool psb_intel_sdvo_detect_hdmi_audio(struct drm_connector *connector)
>  	edid = psb_intel_sdvo_get_edid(connector);
>  	if (edid != NULL && edid->input & DRM_EDID_INPUT_DIGITAL)
is the check here needed at all ?
	drm_detect_monitor_audio--> drm_find_cea_extension -->drm_find_edid_extension (will check for NULL)

I missed DRM_EDID_INPUT_DIGITAL some where ? NTL i would expected drm_detect_monitor_audio to hanle it savely.

re,
 wh

>  		has_audio = drm_detect_monitor_audio(edid);
> +	kfree(edid);
>  
>  	return has_audio;
>  }