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drm/exynos: dpi: Fix NULL pointer dereference with legacy bindings

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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>
This commit is contained in:
Tomasz Figa 2014-06-10 22:57:57 +02:00 committed by Inki Dae
parent 245f98f269
commit aaa51b13ff
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/exynos/exynos_drm_dpi.c
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@ -40,7 +40,7 @@ exynos_dpi_detect(struct drm_connector *connector, bool force)
{
struct exynos_dpi *ctx = connector_to_dpi(connector);
if (!ctx->panel->connector)
if (ctx->panel && !ctx->panel->connector)
drm_panel_attach(ctx->panel, &ctx->connector);
return connector_status_connected;