Re: [PATCH] drm/dp: Make space for null terminator in the DP device ID char array

From: Jani Nikula <jani.nikula@linux.intel.com>
To: dri-devel@lists.freedesktop.org
Cc: intel-gfx@lists.freedesktop.org,
	Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Subject: Re: [PATCH] drm/dp: Make space for null terminator in the	DP device ID char array
Date: Mon, 07 Nov 2016 21:16:44 +0200	[thread overview]
Message-ID: <874m3j85ib.fsf@intel.com> (raw)
In-Reply-To: <1478293580-7817-1-git-send-email-dhinakaran.pandiyan@intel.com>

On Fri, 04 Nov 2016, Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> wrote:
> The DP device identification string read from the DPCD registers is 6
> characters long at max. and we store it in a char array of the same length
> without space for the NULL terminator. Fix this by increasing the array
> size to 7 and initialize it to an empty string.
>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 3e6fe82..3a39312 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -544,7 +544,7 @@ void drm_dp_downstream_debug(struct seq_file *m,
>  				 DP_DETAILED_CAP_INFO_AVAILABLE;
>  	int clk;
>  	int bpc;
> -	char id[6];
> +	char id[7] = "";

Or use %*pE in the format string and provide the length.

BR,
Jani.

>  	int len;
>  	uint8_t rev[2];
>  	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;

-- 
Jani Nikula, Intel Open Source Technology Center
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