linux-kernel - [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add

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Message-Id: <20200410225757.97473-1-colin.king@canonical.com>
Date:   Fri, 10 Apr 2020 23:57:57 +0100
From:   Colin King <colin.king@...onical.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        John Clements <john.clements@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail

From: Colin Ian King <colin.king@...onical.com>

Currently the call to list_add_tail will access an the uninitalised
device_list.prev. Fix this by ensuring device_list is initialized before
adding items to it.

Addresses-Coverity: ("Uninitialized pointer read")
Fixes: b3dbd6d3ec49 ("drm/amdgpu: resolve mGPU RAS query instability")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index b0aa4e1ed4df..caa4969bd46f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -1447,6 +1447,7 @@ static void amdgpu_ras_do_recovery(struct work_struct *work)
 	if  (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
 		device_list_handle = &hive->device_list;
 	} else {
+		INIT_LIST_HEAD(&device_list);
 		list_add_tail(&adev->gmc.xgmi.head, &device_list);
 		device_list_handle = &device_list;
 	}
-- 
2.25.1