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drm/i915/huc: Avoid attempting to authenticate non-existent fw 

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: dac84a3885 ("drm/i915/huc: Support HuC authentication")

v2: Check inside the auth function, split the assert (Michał)
v3: Oops, hit send before compiling, s/huc_fw/huc->fw

Cc: Anusha Srivatsa <anusha.srivatsa@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170120192348.2049-1-michal.winiarski@intel.com
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Michał Winiarski 2017-01-20 20:23:46 +01:00 committed by Chris Wilson
parent 7e79a6836c
commit 7e8d12bc73
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_huc.c
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@ -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)) {