On Tue, May 17, 2022 at 05:57:00PM +0800, Yuanjun Gong wrote:
> From: Gong Yuanjun <ruc_gongyuanjun@xxxxxxx>
>
> In radeon_fp_native_mode(), 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.
>
> The failure status of drm_cvt_mode() on the other path is checked too.
>
> Signed-off-by: Gong Yuanjun <ruc_gongyuanjun@xxxxxxx>
> ---
> drivers/gpu/drm/radeon/radeon_connectors.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
> index 0cb1345c6ba4..fabe4f4ca124 100644
> --- a/drivers/gpu/drm/radeon/radeon_connectors.c
> +++ b/drivers/gpu/drm/radeon/radeon_connectors.c
> @@ -473,6 +473,8 @@ static struct drm_display_mode *radeon_fp_native_mode(struct drm_encoder *encode
> native_mode->vdisplay != 0 &&
> native_mode->clock != 0) {
> mode = drm_mode_duplicate(dev, native_mode);
> + if (!mode)
> + return NULL;
> mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
> drm_mode_set_name(mode);
>
> @@ -487,6 +489,8 @@ static struct drm_display_mode *radeon_fp_native_mode(struct drm_encoder *encode
> * simpler.
> */
> mode = drm_cvt_mode(dev, native_mode->hdisplay, native_mode->vdisplay, 60, true, false, false);
> + if (!mode)
> + return NULL;
> mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
> DRM_DEBUG_KMS("Adding cvt approximation of native panel mode %s\n", mode->name);
> }
> --
> 2.17.1
>
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read:
https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.
</formletter>
