linux-kernel - [PATCH next] drm/i915/huc: Fix missing error code in intel_huc

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Message-ID: <20230614204109.3071989-1-harshit.m.mogalapalli@oracle.com>
Date:   Wed, 14 Jun 2023 13:41:06 -0700
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        John Harrison <John.C.Harrison@...el.com>,
        Alan Previn <alan.previn.teres.alexis@...el.com>,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Michal Wajdeczko <michal.wajdeczko@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Cc:     error27@...il.com, dan.carpenter@...aro.org
Subject: [PATCH next] drm/i915/huc: Fix missing error code in intel_huc_init()

Smatch warns:
	drivers/gpu/drm/i915/gt/uc/intel_huc.c:388
	    intel_huc_init() warn: missing error code 'err'

When the allocation of VMAs fail: The value of err is zero at this
point and it is passed to PTR_ERR and also finally returning zero which
is success instead of failure.

Fix this by adding the missing error code when VMA allocation fails.

Fixes: 08872cb13a71 ("drm/i915/mtl/huc: auth HuC via GSC")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
Found using Static analysis with Smatch, only compile tested.
---
 drivers/gpu/drm/i915/gt/uc/intel_huc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
index e0afd8f89502..ddd146265beb 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
@@ -384,6 +384,7 @@ int intel_huc_init(struct intel_huc *huc)
 
 		vma = intel_guc_allocate_vma(&gt->uc.guc, PXP43_HUC_AUTH_INOUT_SIZE * 2);
 		if (IS_ERR(vma)) {
+			err = PTR_ERR(vma);
 			huc_info(huc, "Failed to allocate heci pkt\n");
 			goto out;
 		}
-- 
2.41.0