linux-kernel - [PATCH 1/2] drm/v3d: cleanup BOs properly when lookup

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Message-Id: <20220321211316.1423294-2-mwen@igalia.com>
Date:   Mon, 21 Mar 2022 20:13:15 -0100
From:   Melissa Wen <mwen@...lia.com>
To:     emma@...olt.net, airlied@...ux.ie, daniel@...ll.ch
Cc:     Rob Herring <robh@...nel.org>, Melissa Wen <mwen@...lia.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] drm/v3d: cleanup BOs properly when lookup_bos fails

When v3d_lookup_bos fails to `allocate validated BO pointers`,
job->bo_count was already set to args->bo_count, but job->bo points to
NULL. In this scenario, we must verify that job->bo is not NULL before
iterating on it to proper clean up a job. Also, drm_gem_object_put
already checks that the object passed is not NULL, doing the job->bo[i]
checker redundant.

Signed-off-by: Melissa Wen <mwen@...lia.com>
---
 drivers/gpu/drm/v3d/v3d_gem.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 92bc0faee84f..926bfc7e07fb 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -358,11 +358,11 @@ v3d_job_free(struct kref *ref)
 	struct v3d_job *job = container_of(ref, struct v3d_job, refcount);
 	int i;
 
-	for (i = 0; i < job->bo_count; i++) {
-		if (job->bo[i])
+	if (job->bo) {
+		for (i = 0; i < job->bo_count; i++)
 			drm_gem_object_put(job->bo[i]);
+		kvfree(job->bo);
 	}
-	kvfree(job->bo);
 
 	dma_fence_put(job->irq_fence);
 	dma_fence_put(job->done_fence);
-- 
2.35.1