[PATCH 4.14 127/189] drm/omap: handle alloc failures in omap_connector

Greg Kroah-Hartman
2018-06-18T08:35:18Z

From: Tomi Valkeinen <tomi.valkeinen@ti.com>

[ Upstream commit 47aaaec818dfd1009d1358974a2931f05dd57203 ]

Handle memory allocation failures in omap_connector to avoid NULL
derefs.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-5-tomi.valkeinen@ti.com
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/omapdrm/omap_connector.c | 10 ++++++++++
1 file changed, 10 insertions(+)

--- a/drivers/gpu/drm/omapdrm/omap_connector.c
+++ b/drivers/gpu/drm/omapdrm/omap_connector.c
@@ -123,6 +123,9 @@ static int omap_connector_get_modes(stru
if (dssdrv->read_edid) {
void *edid = kzalloc(MAX_EDID, GFP_KERNEL);

+ if (!edid)
+ return 0;
+
if ((dssdrv->read_edid(dssdev, edid, MAX_EDID) > 0) &&
drm_edid_is_valid(edid)) {
drm_mode_connector_update_edid_property(
@@ -141,6 +144,9 @@ static int omap_connector_get_modes(stru
struct drm_display_mode *mode = drm_mode_create(dev);
struct videomode vm = {0};

+ if (!mode)
+ return 0;
+
dssdrv->get_timings(dssdev, &vm);

drm_display_mode_from_videomode(&vm, mode);
@@ -196,6 +202,10 @@ static int omap_connector_mode_valid(str
if (!r) {
/* check if vrefresh is still valid */
new_mode = drm_mode_duplicate(dev, mode);
+
+ if (!new_mode)
+ return MODE_BAD;
+
new_mode->clock = vm.pixelclock / 1000;
new_mode->vrefresh = 0;
if (mode->vrefresh == drm_mode_vrefresh(new_mode))