[PATCH 2/2] drm/client: Fix memory leak in drm_client_modeset_probe

[Jocelyn Falempe]

When a new mode is set to modeset->mode, the previous mode should be freed.
This fixes the following kmemleak report:

drm_mode_duplicate+0x45/0x220 [drm]
drm_client_modeset_probe+0x944/0xf50 [drm]
__drm_fb_helper_initial_config_and_unlock+0xb4/0x2c0 [drm_kms_helper]
drm_fbdev_client_hotplug+0x2bc/0x4d0 [drm_kms_helper]
drm_client_register+0x169/0x240 [drm]
ast_pci_probe+0x142/0x190 [ast]
local_pci_probe+0xdc/0x180
work_for_cpu_fn+0x4e/0xa0
process_one_work+0x8b7/0x1540
worker_thread+0x70a/0xed0
kthread+0x29f/0x340
ret_from_fork+0x1f/0x30

cc: <stable at vger.kernel.org>
Reported-by: Zhang Yi <yizhan at redhat.com>
Signed-off-by: Jocelyn Falempe <jfalempe at redhat.com>
---
 drivers/gpu/drm/drm_client_modeset.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
index a4a62aa99984..5d4703b4648a 100644
--- a/drivers/gpu/drm/drm_client_modeset.c
+++ b/drivers/gpu/drm/drm_client_modeset.c
@@ -867,6 +867,9 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
 				break;
 			}
 
+			if (modeset->mode)
+				kfree(modeset->mode);
+				
 			modeset->mode = drm_mode_duplicate(dev, mode);
 			drm_connector_get(connector);
 			modeset->connectors[modeset->num_connectors++] = connector;
-- 
2.41.0