linux-kernel - [PATCH AUTOSEL 6.14 31/44] drm/amdgpu: handle amdgpu_cgs_create_device() errors in amd_powerplay

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Message-Id: <20250403191313.2679091-31-sashal@kernel.org>
Date: Thu,  3 Apr 2025 15:13:00 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Wentao Liang <vulab@...as.ac.cn>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	kenneth.feng@....com,
	christian.koenig@....com,
	airlied@...il.com,
	simona@...ll.ch,
	sunil.khatri@....com,
	boyuan.zhang@....com,
	Jun.Ma2@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.14 31/44] drm/amdgpu: handle amdgpu_cgs_create_device() errors in amd_powerplay_create()

From: Wentao Liang <vulab@...as.ac.cn>

[ Upstream commit 1435e895d4fc967d64e9f5bf81e992ac32f5ac76 ]

Add error handling to propagate amdgpu_cgs_create_device() failures
to the caller. When amdgpu_cgs_create_device() fails, release hwmgr
and return -ENOMEM to prevent null pointer dereference.

[v1]->[v2]: Change error code from -EINVAL to -ENOMEM. Free hwmgr.

Signed-off-by: Wentao Liang <vulab@...as.ac.cn>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
index 686345f75f264..6cd327fecebbc 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/amd_powerplay.c
@@ -51,6 +51,11 @@ static int amd_powerplay_create(struct amdgpu_device *adev)
 	hwmgr->adev = adev;
 	hwmgr->not_vf = !amdgpu_sriov_vf(adev);
 	hwmgr->device = amdgpu_cgs_create_device(adev);
+	if (!hwmgr->device) {
+		kfree(hwmgr);
+		return -ENOMEM;
+	}
+
 	mutex_init(&hwmgr->msg_lock);
 	hwmgr->chip_family = adev->family;
 	hwmgr->chip_id = adev->asic_type;
-- 
2.39.5