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Received: from DM6PR12MB4340.namprd12.prod.outlook.com (2603:10b6:5:2a8::7) by DM6PR12MB4169.namprd12.prod.outlook.com (2603:10b6:5:215::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2900.24; Sat, 11 Apr 2020 04:42:56 +0000 Received: from DM6PR12MB4340.namprd12.prod.outlook.com ([fe80::dd1:b466:cd80:38cf]) by DM6PR12MB4340.namprd12.prod.outlook.com ([fe80::dd1:b466:cd80:38cf%7]) with mapi id 15.20.2878.022; Sat, 11 Apr 2020 04:42:56 +0000 Subject: Re: [PATCH] drm/amdgpu: ensure device_list is initialised before calling list_add_tail To: Colin King , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Zhou , David Airlie , Daniel Vetter , John Clements , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org References: <20200410225757.97473-1-colin.king@canonical.com> From: Andrey Grodzovsky Message-ID: <9d80a5a0-ee0d-1903-2631-6fa573e4453a@amd.com> Date: Sat, 11 Apr 2020 00:42:54 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; 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charset="us-ascii"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 4/10/20 6:57 PM, Colin King wrote: > From: Colin Ian King > > 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") That weird, I see that his is already initialized unconditionally here - https://elixir.bootlin.com/linux/v5.6.3/source/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c#L4022 Andrey > Fixes: b3dbd6d3ec49 ("drm/amdgpu: resolve mGPU RAS query instability") > Signed-off-by: Colin Ian King > --- > 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; > } _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel