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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA9B2C38A02 for ; Wed, 26 Oct 2022 02:01:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230012AbiJZCBG (ORCPT ); Tue, 25 Oct 2022 22:01:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232671AbiJZCBC (ORCPT ); Tue, 25 Oct 2022 22:01:02 -0400 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CDC26A507 for ; Tue, 25 Oct 2022 19:00:59 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018046060;MF=yang.lee@linux.alibaba.com;NM=1;PH=DS;RN=11;SR=0;TI=SMTPD_---0VT500yh_1666749656; Received: from localhost(mailfrom:yang.lee@linux.alibaba.com fp:SMTPD_---0VT500yh_1666749656) by smtp.aliyun-inc.com; Wed, 26 Oct 2022 10:00:57 +0800 From: Yang Li To: Felix.Kuehling@amd.com, alexander.deucher@amd.com Cc: christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Yang Li , Abaci Robot Subject: [PATCH -next] drm/amdkfd: Fix NULL pointer dereference in svm_migrate_to_ram() Date: Wed, 26 Oct 2022 10:00:54 +0800 Message-Id: <20221026020054.57114-1-yang.lee@linux.alibaba.com> X-Mailer: git-send-email 2.20.1.7.g153144c MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ./drivers/gpu/drm/amd/amdkfd/kfd_migrate.c:985:58-62: ERROR: p is NULL but dereferenced. Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=2549 Reported-by: Abaci Robot Signed-off-by: Yang Li --- change in v2: According to Felix's suggestion, move the pr_debug up before the kfd_unref_process call. drivers/gpu/drm/amd/amdkfd/kfd_migrate.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c index 20d6b2578927..b9c8d29d95aa 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_migrate.c @@ -978,12 +978,10 @@ static vm_fault_t svm_migrate_to_ram(struct vm_fault *vmf) out_unlock_svms: mutex_unlock(&p->svms.lock); out_unref_process: + pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); kfd_unref_process(p); out_mmput: mmput(mm); - - pr_debug("CPU fault svms 0x%p address 0x%lx done\n", &p->svms, addr); - return r ? VM_FAULT_SIGBUS : 0; } -- 2.20.1.7.g153144c