This is a note to let you know that I've just added the patch titled
drm/tegra: dsi: Add missing check for of_find_device_by_node
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-tegra-dsi-add-missing-check-for-of_find_device_b.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit dfa940ad5bfe4dbd8008343c435b86ec8ce0aadc
Author: Chen Ni <nichen@xxxxxxxxxxx>
Date: Tue Oct 24 08:07:38 2023 +0000
drm/tegra: dsi: Add missing check for of_find_device_by_node
[ Upstream commit afe6fcb9775882230cd29b529203eabd5d2a638d ]
Add check for the return value of of_find_device_by_node() and return
the error if it fails in order to avoid NULL pointer dereference.
Fixes: e94236cde4d5 ("drm/tegra: dsi: Add ganged mode support")
Signed-off-by: Chen Ni <nichen@xxxxxxxxxxx>
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20231024080738.825553-1-nichen@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index e2903bf7821b1..70cc960d3ff58 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1452,9 +1452,11 @@ static int tegra_dsi_ganged_probe(struct tegra_dsi *dsi)
np = of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0);
if (np) {
struct platform_device *gangster = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!gangster)
+ return -EPROBE_DEFER;
dsi->slave = platform_get_drvdata(gangster);
- of_node_put(np);
if (!dsi->slave) {
put_device(&gangster->dev);
