* [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat
@ 2014-10-11 22:02 Rickard Strandqvist
2014-10-13 8:02 ` Jani Nikula
0 siblings, 1 reply; 3+ messages in thread
From: Rickard Strandqvist @ 2014-10-11 22:02 UTC (permalink / raw)
To: David Airlie, dri-devel; +Cc: Rickard Strandqvist, linux-kernel
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@spectrumdigital.se>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat
2014-10-11 22:02 [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat Rickard Strandqvist
@ 2014-10-13 8:02 ` Jani Nikula
0 siblings, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2014-10-13 8:02 UTC (permalink / raw)
To: David Airlie, dri-devel; +Cc: linux-kernel, Rickard Strandqvist
On Sun, 12 Oct 2014, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.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@spectrumdigital.se>
Reviewed-by: Jani Nikula <jani.nikula@intel.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@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat
@ 2014-10-13 8:02 ` Jani Nikula
0 siblings, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2014-10-13 8:02 UTC (permalink / raw)
To: Rickard Strandqvist, David Airlie, dri-devel
Cc: linux-kernel, Rickard Strandqvist
On Sun, 12 Oct 2014, Rickard Strandqvist <rickard_strandqvist@spectrumdigital.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@spectrumdigital.se>
Reviewed-by: Jani Nikula <jani.nikula@intel.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@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-10-11 22:02 [PATCH v2] gpu: drm: drm_dp_mst_topology.c: Fix improper use of strncat Rickard Strandqvist
2014-10-13 8:02 ` Jani Nikula
2014-10-13 8:02 ` Jani Nikula
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