linux-kernel - [PATCH AUTOSEL 5.15 04/98] drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma

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Message-Id: <20220401143742.1952163-4-sashal@kernel.org>
Date:   Fri,  1 Apr 2022 10:36:08 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Xin Xiong <xiongx18@...an.edu.cn>,
        Christian König <christian.koenig@....com>,
        Xin Tan <tanxin.ctf@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, Xinhui.Pan@....com,
        airlied@...ux.ie, daniel@...ll.ch, sumit.semwal@...aro.org,
        JinhuiEric.Huang@....com, nirmoy.das@....com, Ken.Xue@....com,
        Lang.Yu@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linaro-mm-sig@...ts.linaro.org
Subject: [PATCH AUTOSEL 5.15 04/98] drm/amd/amdgpu/amdgpu_cs: fix refcount leak of a dma_fence obj

From: Xin Xiong <xiongx18@...an.edu.cn>

[ Upstream commit dfced44f122c500004a48ecc8db516bb6a295a1b ]

This issue takes place in an error path in
amdgpu_cs_fence_to_handle_ioctl(). When `info->in.what` falls into
default case, the function simply returns -EINVAL, forgetting to
decrement the reference count of a dma_fence obj, which is bumped
earlier by amdgpu_cs_get_fence(). This may result in reference count
leaks.

Fix it by decreasing the refcount of specific object before returning
the error code.

Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 913f9eaa9cd6..aa823f154199 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1508,6 +1508,7 @@ int amdgpu_cs_fence_to_handle_ioctl(struct drm_device *dev, void *data,
 		return 0;
 
 	default:
+		dma_fence_put(fence);
 		return -EINVAL;
 	}
 }
-- 
2.34.1