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drm/tegra: dsi: Add missing check for of_find_device_by_node

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[ 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: e94236cde4 ("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@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chen Ni
2023-10-24 08:07:38 +00:00
committed by Sasha Levin
parent 03ad5ad53e
commit 93128052bf
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/tegra/dsi.c
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@@ -1534,9 +1534,11 @@ 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);