On 2023-09-26 01:56, Cong Liu wrote:
> This patch fixes a null pointer dereference in the error message that is
> printed when the Display Core (DC) fails to initialize. The original
> message includes the DC version number, which is undefined if the DC is
> not initialized.
>
> Fixes: 9788d087caff ("drm/amd/display: improve the message printed when
> loading DC")
> Signed-off-by: Cong Liu <liuco...@kylinos.cn>
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 8e98dda1e084..bf52a909f558 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -1703,8 +1703,7 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
> DRM_INFO("Display Core v%s initialized on %s\n", DC_VER,
> dce_version_to_string(adev->dm.dc->ctx->dce_version));
> } else {
> - DRM_INFO("Display Core v%s failed to initialize on %s\n",
> DC_VER,
> - dce_version_to_string(adev->dm.dc->ctx->dce_version));
> + DRM_INFO("Display Core failed to initialize with v%s!\n",
> DC_VER);
There is value in printing the version number. Let's not remove it.
Instead you can probably fix it by doing a NULL check on adev->dm.dc->ctx.
Harry
> goto error;
> }
>
