[PATCH] drm: of: fix leak of port_node

Tobias Jordan
2020-09-25T22:37:05Z

The for_each_child_of_node loop in drm_of_lvds_get_remote_pixels_type
bails out in two occasions. Originally, both were calling of_node_put to
clean up, but (probably a typo) for the wrong variable.

One of these typos was fixed in commit 4ee48cc5586b ("drm: of: Fix
double-free bug"), but that missed the leak of the original port_node
and also the first error path which was obviously wrong as well.

Fix the leak of port_node in the error paths by calling of_node_put on
it.

Fixes: 6529007522de ("drm: of: Add drm_of_lvds_get_dual_link_pixel_order")
Signed-off-by: Tobias Jordan <kernel@cdqe.de>
---
drivers/gpu/drm/drm_of.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
index ca04c34e8251..5c136bd5a671 100644
--- a/drivers/gpu/drm/drm_of.c
+++ b/drivers/gpu/drm/drm_of.c
@@ -315,7 +315,7 @@ static int drm_of_lvds_get_remote_pixels_type(

remote_port = of_graph_get_remote_port(endpoint);
if (!remote_port) {
- of_node_put(remote_port);
+ of_node_put(port_node);
return -EPIPE;
}

@@ -331,8 +331,10 @@ static int drm_of_lvds_get_remote_pixels_type(
* configurations by passing the endpoints explicitly to
* drm_of_lvds_get_dual_link_pixel_order().
*/
- if (!current_pt || pixels_type != current_pt)
+ if (!current_pt || pixels_type != current_pt) {
+ of_node_put(port_node);
return -EINVAL;
+ }
}

return pixels_type;
--
2.20.1