From nobody Wed Dec 17 19:08:04 2025 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 BAB9EC61D99 for ; Thu, 23 Nov 2023 01:23:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231410AbjKWBXC (ORCPT ); Wed, 22 Nov 2023 20:23:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229453AbjKWBXA (ORCPT ); Wed, 22 Nov 2023 20:23:00 -0500 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3DF2092 for ; Wed, 22 Nov 2023 17:22:54 -0800 (PST) X-UUID: 36401da4109c4857a4a59b4b09b53f8d-20231123 X-CID-O-RULE: Release_Ham X-CID-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.32,REQID:0645df19-50f1-4e62-823b-6bbd218f57f0,IP:15, URL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-15,FILE:0,BULK:0,RULE:Release_Ham,ACT ION:release,TS:-5 X-CID-INFO: VERSION:1.1.32,REQID:0645df19-50f1-4e62-823b-6bbd218f57f0,IP:15,UR L:0,TC:0,Content:-5,EDM:0,RT:0,SF:-15,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-5 X-CID-META: VersionHash:5f78ec9,CLOUDID:ecb2b495-10ce-4e4b-85c2-c9b5229ff92b,B ulkID:231123092241R6NRFKKH,BulkQuantity:0,Recheck:0,SF:66|38|24|17|19|44|1 02,TC:nil,Content:0,EDM:-3,IP:-2,URL:1,File:nil,Bulk:nil,QS:nil,BEC:nil,CO L:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-CID-FACTOR: TF_CID_SPAM_ULS,TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD, TF_CID_SPAM_FSI X-UUID: 36401da4109c4857a4a59b4b09b53f8d-20231123 X-User: yaolu@kylinos.cn Received: from localhost.localdomain [(116.128.244.169)] by mailgw (envelope-from ) (Generic MTA) with ESMTP id 1513233395; Thu, 23 Nov 2023 09:22:38 +0800 From: Lu Yao To: airlied@gmail.com, daniel@ffwll.ch Cc: alexander.deucher@amd.com, christian.koenig@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Lu Yao Subject: [PATCH v2] drm/amdgpu: Fix cat debugfs amdgpu_regs_didt causes kernel null pointer Date: Thu, 23 Nov 2023 09:22:34 +0800 Message-Id: <20231123012234.5783-1-yaolu@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231122093509.34302-1-yaolu@kylinos.cn> References: <20231122093509.34302-1-yaolu@kylinos.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" For 'AMDGPU_FAMILY_SI' family cards, in 'si_common_early_init' func, init 'didt_rreg' and 'didt_wreg' to 'NULL'. But in func 'amdgpu_debugfs_regs_didt_read/write', using 'RREG32_DIDT' 'WREG32_DIDT' lacks of relevant judgment. And other 'amdgpu_ip_block_version' that use these two definitions won't be added for 'AMDGPU_FAMILY_SI'. So, add null pointer judgment before calling. Signed-off-by: Lu Yao Reviewed-by: Christian K=C3=B6nig --- Changes in v2: 1. Drop dev_err message. 2. Change error code from 'EPERM' to 'EOPNOTSUPP' Link to v1: https://lore.kernel.org/all/20231122093509.34302-1-yaolu@kylino= s.cn/ Thanks Christian for his comments. --- drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/= amd/amdgpu/amdgpu_debugfs.c index a53f436fa9f1..e098cd66fa2a 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c @@ -638,6 +638,9 @@ static ssize_t amdgpu_debugfs_regs_didt_read(struct fil= e *f, char __user *buf, if (size & 0x3 || *pos & 0x3) return -EINVAL; =20 + if (adev->didt_rreg =3D=3D NULL) + return -EOPNOTSUPP; + r =3D pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev); @@ -694,6 +697,9 @@ static ssize_t amdgpu_debugfs_regs_didt_write(struct fi= le *f, const char __user if (size & 0x3 || *pos & 0x3) return -EINVAL; =20 + if (adev->didt_wreg =3D=3D NULL) + return -EOPNOTSUPP; + r =3D pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev); --=20 2.25.1