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drm/debugfs: fix potential NULL pointer dereference

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encoder->funcs entry might be NULL, so check it first before calling its
methods. This fixes NULL pointer dereference observed on Rasberry Pi
3b/4b boards.

Fixes: caf525ed45 ("drm/encoder: register per-encoder debugfs dir")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231205130631.3456986-1-m.szyprowski@samsung.com
This commit is contained in:
Marek Szyprowski 2023-12-05 14:06:31 +01:00 committed by Dmitry Baryshkov
parent 812cc1da7f
commit 76385d493c
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/drm_debugfs.c
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@ -638,7 +638,7 @@ void drm_debugfs_encoder_add(struct drm_encoder *encoder)
debugfs_create_file("bridges", 0444, root, encoder,
&bridges_fops);
if (encoder->funcs->debugfs_init)
if (encoder->funcs && encoder->funcs->debugfs_init)
encoder->funcs->debugfs_init(encoder, root);
}