Re: [PATCH] drm/exynos: dpi: Fix NULL pointer dereference with legacy bindings

[Inki Dae <inki.dae@samsung.com>]

On 2014년 06월 18일 09:09, Tomasz Figa wrote:
> On 10.06.2014 22:57, Tomasz Figa wrote:
>> 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>
>> ---
>>  drivers/gpu/drm/exynos/exynos_drm_dpi.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dpi.c b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
>> index f1b8587..f44bd90 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_dpi.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_dpi.c
>> @@ -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;
>>
> 
> Ping.

Applied.

Thanks,
Inki Dae

> 
> Best regards,
> Tomasz
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