From: Chen Ni nichen@iscas.ac.cn
[ 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@iscas.ac.cn Signed-off-by: Thierry Reding treding@nvidia.com Link: https://patchwork.freedesktop.org/patch/msgid/20231024080738.825553-1-nichen... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/tegra/dsi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c index a9870c8283749..4101b2e012118 100644 --- a/drivers/gpu/drm/tegra/dsi.c +++ b/drivers/gpu/drm/tegra/dsi.c @@ -1543,9 +1543,11 @@ 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);