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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>
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;