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Message-ID: <87y4skgzxb.fsf@intel.com>
Date: Mon, 13 Oct 2014 11:02:40 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
David Airlie <airlied@...ux.ie>,
dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org,
Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Subject: Re: [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat
On Sun, 12 Oct 2014, Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se> wrote:
> Fixed wrong usage of strncat, switched to strlcpy.
> While sending the string size to function to reduce
> the potential for misuse in future.
>
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Reviewed-by: Jani Nikula <jani.nikula@...el.com>
> ---
> drivers/gpu/drm/drm_dp_mst_topology.c | 15 ++++++++-------
> 1 file changed, 8 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index ac3c273..2a146d1 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -995,19 +995,20 @@ static void drm_dp_check_port_guid(struct drm_dp_mst_branch *mstb,
>
> static void build_mst_prop_path(struct drm_dp_mst_port *port,
> struct drm_dp_mst_branch *mstb,
> - char *proppath)
> + char *proppath,
> + size_t proppath_size)
> {
> int i;
> char temp[8];
> - snprintf(proppath, 255, "mst:%d", mstb->mgr->conn_base_id);
> + snprintf(proppath, proppath_size, "mst:%d", mstb->mgr->conn_base_id);
> for (i = 0; i < (mstb->lct - 1); i++) {
> int shift = (i % 2) ? 0 : 4;
> int port_num = mstb->rad[i / 2] >> shift;
> - snprintf(temp, 8, "-%d", port_num);
> - strncat(proppath, temp, 255);
> + snprintf(temp, sizeof(temp), "-%d", port_num);
> + strlcat(proppath, temp, proppath_size);
> }
> - snprintf(temp, 8, "-%d", port->port_num);
> - strncat(proppath, temp, 255);
> + snprintf(temp, sizeof(temp), "-%d", port->port_num);
> + strlcat(proppath, temp, proppath_size);
> }
>
> static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
> @@ -1078,7 +1079,7 @@ static void drm_dp_add_port(struct drm_dp_mst_branch *mstb,
>
> if (created && !port->input) {
> char proppath[255];
> - build_mst_prop_path(port, mstb, proppath);
> + build_mst_prop_path(port, mstb, proppath, sizeof(proppath));
> port->connector = (*mstb->mgr->cbs->add_connector)(mstb->mgr, port, proppath);
> }
>
> --
> 1.7.10.4
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Technology Center
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