linux-kernel - [PATCH] amdgpu: fixes memleak issue when init failed

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Date:   Tue, 21 Apr 2020 04:17:13 -0700
From:   Bernard Zhao <bernard@...o.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Tom St Denis <tom.stdenis@....com>,
        Ori Messinger <Ori.Messinger@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Bernard Zhao <bernard@...o.com>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: [PATCH] amdgpu: fixes memleak issue when init failed

VRAM manager and DRM MM when init failed, there is no operaction
to free kzalloc memory & remove device file.
This will lead to memleak & cause stability issue.

Signed-off-by: Bernard Zhao <bernard@...o.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 24 ++++++++++++++++----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
index 82a3299e53c0..4c5fb153e6b4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
@@ -175,30 +175,44 @@ static int amdgpu_vram_mgr_init(struct ttm_mem_type_manager *man,
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_total);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_vram_total\n");
-		return ret;
+		goto VRAM_TOTAL_FAIL;
 	}
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_vis_vram_total\n");
-		return ret;
+		goto VIS_VRAM_TOTA_FAIL;
 	}
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_used);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_vram_used\n");
-		return ret;
+		goto VRAM_USED_FAIL;
 	}
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_vis_vram_used\n");
-		return ret;
+		goto VIS_VRAM_USED_FAIL;
 	}
 	ret = device_create_file(adev->dev, &dev_attr_mem_info_vram_vendor);
 	if (ret) {
 		DRM_ERROR("Failed to create device file mem_info_vram_vendor\n");
-		return ret;
+		goto VRAM_VERDOR_FAIL;
 	}
 
 	return 0;
+
+VRAM_VERDOR_FAIL:
+	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_used);
+VIS_VRAM_USED_FAIL:
+	device_remove_file(adev->dev, &dev_attr_mem_info_vram_used);
+RVAM_USED_FAIL:
+	device_remove_file(adev->dev, &dev_attr_mem_info_vis_vram_total);
+VIS_VRAM_TOTA_FAIL:
+	device_remove_file(adev->dev, &dev_attr_mem_info_vram_total);
+VRAM_TOTAL_FAIL:
+	kfree(mgr);
+	man->priv = NULL;
+
+	return ret;
 }
 
 /**
-- 
2.26.2