Add check for the return value of komeda_get_layer_fourcc_list()
to catch the potential exception.

Fixes: 5d51f6c0da1b ("drm/komeda: Add writeback support")
Cc: stable@vger.kernel.org
Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>
---
 drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
index ebccb74306a7..f30b3d5eeca5 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
@@ -160,6 +160,10 @@ static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
 	formats = komeda_get_layer_fourcc_list(&mdev->fmt_tbl,
 					       kwb_conn->wb_layer->layer_type,
 					       &n_formats);
+	if (!formats) {
+		kfree(kwb_conn);
+		return -ENOMEM;
+	}
 
 	err = drm_writeback_connector_init(&kms->base, wb_conn,
 					   &komeda_wb_connector_funcs,
-- 
2.25.1

Hi Haoxiang,

For reasons that I have not uncovered yet, the work email servers never
delivered your message, I have discovered it today accidentally while
looking in a backup I have at home.

On Thu, Dec 19, 2024 at 05:02:56PM +0800, Haoxiang Li wrote:
> Add check for the return value of komeda_get_layer_fourcc_list()
> to catch the potential exception.
> 
> Fixes: 5d51f6c0da1b ("drm/komeda: Add writeback support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Haoxiang Li <haoxiang_li2024@163.com>

Acked-by: Liviu Dudau <liviu.dudau@arm.com>

Best regards,
Liviu

> ---
>  drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> index ebccb74306a7..f30b3d5eeca5 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_wb_connector.c
> @@ -160,6 +160,10 @@ static int komeda_wb_connector_add(struct komeda_kms_dev *kms,
>  	formats = komeda_get_layer_fourcc_list(&mdev->fmt_tbl,
>  					       kwb_conn->wb_layer->layer_type,
>  					       &n_formats);
> +	if (!formats) {
> +		kfree(kwb_conn);
> +		return -ENOMEM;
> +	}
>  
>  	err = drm_writeback_connector_init(&kms->base, wb_conn,
>  					   &komeda_wb_connector_funcs,
> -- 
> 2.25.1
> 

-- 
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a mad desire to attack the precocious abacus with an axe.
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