forked from Minki/linux
drm/exynos: dpi: Fix NULL pointer dereference with legacy bindings
If there is no panel node in DT and instead display timings are provided directly in FIMD node, there is no panel object created and ctx->panel becomes NULL. However during Exynos DRM initialization drm_helper_hpd_irq_event() is called, which in turns calls exynos_dpi_detect(), which dereferences ctx->panel without a check, causing a NULL pointer derefrence. This patch fixes the issue by adding necessary NULL pointer check. Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com> Reviewed-by: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>
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@ -40,7 +40,7 @@ exynos_dpi_detect(struct drm_connector *connector, bool force)
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{
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struct exynos_dpi *ctx = connector_to_dpi(connector);
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if (!ctx->panel->connector)
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if (ctx->panel && !ctx->panel->connector)
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drm_panel_attach(ctx->panel, &ctx->connector);
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return connector_status_connected;
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