[PATCH] drm/amdgpu: fix a possible null pointer dereference

[Joshua Ashton]

Are you planning on submitting a bogus CVE for this patch too?

- Joshie 🐸✨

On June 22, 2024 9:22:19 AM GMT+01:00, Ma Ke <make24 at iscas.ac.cn> wrote:
>In amdgpu_connector_add_common_modes(), the return value of drm_cvt_mode()
>is assigned to mode, which will lead to a NULL pointer dereference on
>failure of drm_cvt_mode(). Add a check to avoid npd.
>
>Signed-off-by: Ma Ke <make24 at iscas.ac.cn>
>---
> drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 2 ++
> 1 file changed, 2 insertions(+)
>
>diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
>index 9caba10315a8..6cf946adb6fe 100644
>--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
>+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
>@@ -458,6 +458,8 @@ static void amdgpu_connector_add_common_modes(struct drm_encoder *encoder,
> 			continue;
> 
> 		mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false);
>+		if (!mode)
>+			continue;
> 		drm_mode_probed_add(connector, mode);
> 	}
> }