On Tue, Jul 9, 2024 at 1:33 PM Ma Ke <make24@xxxxxxxxxxx> wrote:
>
> In cdv_intel_lvds_get_modes(), the return value of drm_mode_duplicate()
> is assigned to mode, which will lead to a NULL pointer dereference on
> failure of drm_mode_duplicate(). Add a check to avoid npd.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: 6a227d5fd6c4 ("gma500: Add support for Cedarview")
> Signed-off-by: Ma Ke <make24@xxxxxxxxxxx>
Thanks for the patch!
Pushed to drm-misc-fixes
-Patrik
> ---
> Changes in v4:
> - revised the recipient email list, apologize for the inadvertent mistake.
> Changes in v3:
> - added the recipient's email address, due to the prolonged absence of a
> response from the recipients.
> Changes in v2:
> - modified the patch according to suggestions from other patchs;
> - added Fixes line;
> - added Cc stable;
> - Link: https://lore.kernel.org/lkml/20240622072514.1867582-1-make24@xxxxxxxxxxx/T/
> ---
> drivers/gpu/drm/gma500/cdv_intel_lvds.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/gma500/cdv_intel_lvds.c b/drivers/gpu/drm/gma500/cdv_intel_lvds.c
> index f08a6803dc18..3adc2c9ab72d 100644
> --- a/drivers/gpu/drm/gma500/cdv_intel_lvds.c
> +++ b/drivers/gpu/drm/gma500/cdv_intel_lvds.c
> @@ -311,6 +311,9 @@ static int cdv_intel_lvds_get_modes(struct drm_connector *connector)
> if (mode_dev->panel_fixed_mode != NULL) {
> struct drm_display_mode *mode =
> drm_mode_duplicate(dev, mode_dev->panel_fixed_mode);
> + if (!mode)
> + return 0;
> +
> drm_mode_probed_add(connector, mode);
> return 1;
> }
> --
> 2.25.1
>
