On Fri, Jan 20, 2017 at 04:28:23PM +0100, Michał Winiarski wrote:
> HuC authentication is called even if HuC firmware is not present in the
> system, leading to NULL ptr dereference on not allocated gem_object.
> Let's avoid trying to authenticate HuC if its firmware is not loaded
> successfully.
>
> Fixes: dac84a388528 ("drm/i915/huc: Support HuC authentication")
>
> v2: Check inside the auth function, split the assert (Michał)
>
> Cc: Anusha Srivatsa <[email protected]>
> Cc: Arkadiusz Hiler <[email protected]>
> Cc: Chris Wilson <[email protected]>
> Cc: Michal Wajdeczko <[email protected]>
> Signed-off-by: Michał Winiarski <[email protected]>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko.intel.com>
> ---
> drivers/gpu/drm/i915/intel_huc.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_huc.c
> b/drivers/gpu/drm/i915/intel_huc.c
> index 897ef31..d1e65fa 100644
> --- a/drivers/gpu/drm/i915/intel_huc.c
> +++ b/drivers/gpu/drm/i915/intel_huc.c
> @@ -299,6 +299,9 @@ void intel_guc_auth_huc(struct drm_i915_private *dev_priv)
> int ret;
> u32 data[2];
>
> + if (huc_fw->load_status != INTEL_UC_FIRMWARE_SUCCESS)
> + return;
> +
> vma = i915_gem_object_ggtt_pin(huc->fw.obj, NULL, 0, 0,
> PIN_OFFSET_BIAS | GUC_WOPCM_TOP);
> if (IS_ERR(vma)) {
> --
> 2.9.3
>
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