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Fri, 29 May 2020 02:06:27 +0000 Subject: Re: [PATCH][next] drm/amdkfd: fix a dereference of pdd before it is null checked To: Colin King , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Airlie , Daniel Vetter , Mukul Joshi , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org References: <20200528222453.536137-1-colin.king@canonical.com> From: Felix Kuehling Message-ID: Date: Thu, 28 May 2020 22:06:14 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 In-Reply-To: <20200528222453.536137-1-colin.king@canonical.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-ClientProxiedBy: BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) To SN1PR12MB2414.namprd12.prod.outlook.com (2603:10b6:802:2e::31) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.252.0.178] (165.204.84.11) by BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.19 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 34c71310-dd95-4301-03da-08d80374e4ff X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 May 2020 02:06:26.8801 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: WZJLwpF/belaR7HMp3FQImEPNZbw3eh4p2VaO5Shtq0e3w9WtzXmmZAke0+PduBnvmhU+zLwrjhlRNbPnck75w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2382 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2020-05-28 18:24, Colin King wrote: > From: Colin Ian King > > Currently pointer pdd is being dereferenced when assigning pointer > dpm and then pdd is being null checked. Fix this by checking if > pdd is null before the dereference of pdd occurs. > > Addresses-Coverity: ("Dereference before null check") > Fixes: 522b89c63370 ("drm/amdkfd: Track SDMA utilization per process") > Signed-off-by: Colin Ian King Reviewed-by: Felix Kuehling I applied the patch to our internal amd-staging-drm-next. Regards,   Felix > --- > drivers/gpu/drm/amd/amdkfd/kfd_process.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c > index 25636789f3d3..bdc58741b32e 100644 > --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c > @@ -103,10 +103,11 @@ static void kfd_sdma_activity_worker(struct work_struct *work) > return; > > pdd = workarea->pdd; > + if (!pdd) > + return; > dqm = pdd->dev->dqm; > qpd = &pdd->qpd; > - > - if (!pdd || !dqm || !qpd) > + if (!dqm || !qpd) > return; > > mm = get_task_mm(pdd->process->lead_thread); From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felix Kuehling Date: Fri, 29 May 2020 02:06:14 +0000 Subject: Re: [PATCH][next] drm/amdkfd: fix a dereference of pdd before it is null checked Message-Id: List-Id: References: <20200528222453.536137-1-colin.king@canonical.com> In-Reply-To: <20200528222453.536137-1-colin.king@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: Colin King , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Airlie , Daniel Vetter , Mukul Joshi , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org On 2020-05-28 18:24, Colin King wrote: > From: Colin Ian King > > Currently pointer pdd is being dereferenced when assigning pointer > dpm and then pdd is being null checked. Fix this by checking if > pdd is null before the dereference of pdd occurs. > > Addresses-Coverity: ("Dereference before null check") > Fixes: 522b89c63370 ("drm/amdkfd: Track SDMA utilization per process") > Signed-off-by: Colin Ian King Reviewed-by: Felix Kuehling I applied the patch to our internal amd-staging-drm-next. Regards, =C2=A0 Felix > --- > drivers/gpu/drm/amd/amdkfd/kfd_process.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/a= md/amdkfd/kfd_process.c > index 25636789f3d3..bdc58741b32e 100644 > --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c > @@ -103,10 +103,11 @@ static void kfd_sdma_activity_worker(struct work_st= ruct *work) > return; > =20 > pdd =3D workarea->pdd; > + if (!pdd) > + return; > dqm =3D pdd->dev->dqm; > qpd =3D &pdd->qpd; > - > - if (!pdd || !dqm || !qpd) > + if (!dqm || !qpd) > return; > =20 > mm =3D get_task_mm(pdd->process->lead_thread); From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E150DC433E0 for ; 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Fri, 29 May 2020 02:06:27 +0000 Subject: Re: [PATCH][next] drm/amdkfd: fix a dereference of pdd before it is null checked To: Colin King , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Airlie , Daniel Vetter , Mukul Joshi , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org References: <20200528222453.536137-1-colin.king@canonical.com> From: Felix Kuehling Message-ID: Date: Thu, 28 May 2020 22:06:14 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 In-Reply-To: <20200528222453.536137-1-colin.king@canonical.com> Content-Language: en-US X-ClientProxiedBy: BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) To SN1PR12MB2414.namprd12.prod.outlook.com (2603:10b6:802:2e::31) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.252.0.178] (165.204.84.11) by BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.19 via Frontend Transport; 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Fri, 29 May 2020 02:06:27 +0000 Subject: Re: [PATCH][next] drm/amdkfd: fix a dereference of pdd before it is null checked To: Colin King , Alex Deucher , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Airlie , Daniel Vetter , Mukul Joshi , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org References: <20200528222453.536137-1-colin.king@canonical.com> From: Felix Kuehling Message-ID: Date: Thu, 28 May 2020 22:06:14 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 In-Reply-To: <20200528222453.536137-1-colin.king@canonical.com> Content-Language: en-US X-ClientProxiedBy: BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) To SN1PR12MB2414.namprd12.prod.outlook.com (2603:10b6:802:2e::31) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.252.0.178] (165.204.84.11) by BN6PR03CA0016.namprd03.prod.outlook.com (2603:10b6:404:23::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.19 via Frontend Transport; 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