linux-kernel - [PATCH AUTOSEL 6.1 23/61] drm/amdgpu: fix dereference after null check

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Message-ID: <20240801002803.3935985-23-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:25:41 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Jesse Zhang <jesse.zhang@....com>,
	Jesse Zhang <Jesse.Zhang@....com>,
	Tim Huang <Tim.Huang@....com>,
	Alex Deucher <alexander.deucher@....com>,
	Sasha Levin <sashal@...nel.org>,
	christian.koenig@....com,
	Xinhui.Pan@....com,
	airlied@...il.com,
	daniel@...ll.ch,
	Hawking.Zhang@....com,
	lijo.lazar@....com,
	mario.limonciello@....com,
	candice.li@....com,
	Jun.Ma2@....com,
	victorchengchi.lu@....com,
	andrealmeid@...lia.com,
	hamza.mahfooz@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.1 23/61] drm/amdgpu: fix dereference after null check

From: Jesse Zhang <jesse.zhang@....com>

[ Upstream commit b1f7810b05d1950350ac2e06992982974343e441 ]

check the pointer hive before use.

Signed-off-by: Jesse Zhang <Jesse.Zhang@....com>
Reviewed-by: Tim Huang <Tim.Huang@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 98ed116b5a48e..1334e540bb67a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -5390,7 +5390,7 @@ int amdgpu_device_gpu_recover(struct amdgpu_device *adev,
 	 * to put adev in the 1st position.
 	 */
 	INIT_LIST_HEAD(&device_list);
-	if (!amdgpu_sriov_vf(adev) && (adev->gmc.xgmi.num_physical_nodes > 1)) {
+	if (!amdgpu_sriov_vf(adev) && (adev->gmc.xgmi.num_physical_nodes > 1) && hive) {
 		list_for_each_entry(tmp_adev, &hive->device_list, gmc.xgmi.head) {
 			list_add_tail(&tmp_adev->reset_list, &device_list);
 			if (gpu_reset_for_dev_remove && adev->shutdown)
-- 
2.43.0