[Intel-gfx] [PATCH v2 1/2] drm/i915/huc: Avoid attempting to authenticate non-existent fw

[Michał Winiarski]

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 <anusha.srivatsa at intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Signed-off-by: Michał Winiarski <michal.winiarski at 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