From patchwork Mon Apr 25 14:10:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shile Zhang X-Patchwork-Id: 568060 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 510B1C433F5 for ; Mon, 25 Apr 2022 14:10:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234561AbiDYOOB (ORCPT ); Mon, 25 Apr 2022 10:14:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56186 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234697AbiDYOOA (ORCPT ); Mon, 25 Apr 2022 10:14:00 -0400 Received: from out30-56.freemail.mail.aliyun.com (out30-56.freemail.mail.aliyun.com [115.124.30.56]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 05B17BDD; Mon, 25 Apr 2022 07:10:55 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS; BC=-1|-1; BR=01201311R451e4; CH=green; DM=||false|; DS=||; FP=0|-1|-1|-1|0|-1|-1|-1; HT=e01e04407; MF=shile.zhang@linux.alibaba.com; NM=1; PH=DS; RN=7; SR=0; TI=SMTPD_---0VBH0a0i_1650895845; Received: from e18g09479.et15sqa.tbsite.net(mailfrom:shile.zhang@linux.alibaba.com fp:SMTPD_---0VBH0a0i_1650895845) by smtp.aliyun-inc.com(127.0.0.1); Mon, 25 Apr 2022 22:10:52 +0800 From: Shile Zhang To: Greg Kroah-Hartman , David Airlie , Daniel Vetter Cc: stable@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Shile Zhang Subject: [PATCH v2] drm/cirrus: fix a NULL vs IS_ERR() checks Date: Mon, 25 Apr 2022 22:10:43 +0800 Message-Id: <20220425141043.214024-1-shile.zhang@linux.alibaba.com> X-Mailer: git-send-email 2.33.0.rc2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The function drm_gem_shmem_vmap can returns error pointers as well, which could cause following kernel crash: BUG: unable to handle page fault for address: fffffffffffffffc PGD 1426a12067 P4D 1426a12067 PUD 1426a14067 PMD 0 Oops: 0000 [#1] SMP NOPTI CPU: 12 PID: 3598532 Comm: stress-ng Kdump: loaded Not tainted 5.10.50.x86_64 #1 ... RIP: 0010:memcpy_toio+0x23/0x50 Code: 00 00 00 00 0f 1f 00 0f 1f 44 00 00 48 85 d2 74 28 40 f6 c7 01 75 2b 48 83 fa 01 76 06 40 f6 c7 02 75 17 48 89 d1 48 c1 e9 02 a5 f6 c2 02 74 02 66 a5 f6 c2 01 74 01 a4 c3 66 a5 48 83 ea 02 RSP: 0018:ffffafbf8a203c68 EFLAGS: 00010216 RAX: 0000000000000000 RBX: fffffffffffffffc RCX: 0000000000000200 RDX: 0000000000000800 RSI: fffffffffffffffc RDI: ffffafbf82000000 RBP: ffffafbf82000000 R08: 0000000000000002 R09: 0000000000000000 R10: 00000000000002b5 R11: 0000000000000000 R12: 0000000000000800 R13: ffff8a6801099300 R14: 0000000000000001 R15: 0000000000000300 FS: 00007f4a6bc5f740(0000) GS:ffff8a8641900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffffc CR3: 00000016d3874001 CR4: 00000000003606e0 Call Trace: drm_fb_memcpy_dstclip+0x5e/0x80 [drm_kms_helper] cirrus_fb_blit_rect.isra.0+0xb7/0xe0 [cirrus] cirrus_pipe_update+0x9f/0xa8 [cirrus] drm_atomic_helper_commit_planes+0xb8/0x220 [drm_kms_helper] drm_atomic_helper_commit_tail+0x42/0x80 [drm_kms_helper] commit_tail+0xce/0x130 [drm_kms_helper] drm_atomic_helper_commit+0x113/0x140 [drm_kms_helper] drm_client_modeset_commit_atomic+0x1c4/0x200 [drm] drm_client_modeset_commit_locked+0x53/0x80 [drm] drm_client_modeset_commit+0x24/0x40 [drm] drm_fbdev_client_restore+0x48/0x85 [drm_kms_helper] drm_client_dev_restore+0x64/0xb0 [drm] drm_release+0xf2/0x110 [drm] __fput+0x96/0x240 task_work_run+0x5c/0x90 exit_to_user_mode_loop+0xce/0xd0 exit_to_user_mode_prepare+0x6a/0x70 syscall_exit_to_user_mode+0x12/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f4a6bd82c2b Fixes: ab3e023b1b4c9 ("drm/cirrus: rewrite and modernize driver.") Signed-off-by: Shile Zhang --- v2: rebase to latest stable linux-5.10.y branch. v1: https://lore.kernel.org/lkml/550e9439-adf6-3df8-41a0-9a7ee5447907@linux.alibaba.com/ --- drivers/gpu/drm/tiny/cirrus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tiny/cirrus.c b/drivers/gpu/drm/tiny/cirrus.c index 744a8e337e41e..d64f6bb767eeb 100644 --- a/drivers/gpu/drm/tiny/cirrus.c +++ b/drivers/gpu/drm/tiny/cirrus.c @@ -323,7 +323,7 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb, ret = -ENOMEM; vmap = drm_gem_shmem_vmap(fb->obj[0]); - if (!vmap) + if (IS_ERR_OR_NULL(vmap)) goto out_dev_exit; if (cirrus->cpp == fb->format->cpp[0])