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drm/tegra: dsi: Add missing check for of_find_device_by_node
author
Chen Ni
<nichen@iscas.ac.cn>
Tue, 24 Oct 2023 08:07:38 +0000
(08:07 +0000)
committer
Thierry Reding
<treding@nvidia.com>
Thu, 14 Dec 2023 17:20:23 +0000
(18:20 +0100)
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@iscas.ac.cn
drivers/gpu/drm/tegra/dsi.c
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diff --git
a/drivers/gpu/drm/tegra/dsi.c
b/drivers/gpu/drm/tegra/dsi.c
index
fbfe92a
..
e419b76
100644
(file)
--- a/
drivers/gpu/drm/tegra/dsi.c
+++ b/
drivers/gpu/drm/tegra/dsi.c
@@
-1544,9
+1544,11
@@
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);