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 719DBC4167B for ; Mon, 4 Dec 2023 20:39:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376281AbjLDUjn (ORCPT ); Mon, 4 Dec 2023 15:39:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39758 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235475AbjLDUjO (ORCPT ); Mon, 4 Dec 2023 15:39:14 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DD5863C12 for ; Mon, 4 Dec 2023 12:36:47 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 77B52C433C8; Mon, 4 Dec 2023 20:36:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701722207; bh=7SpBkG5U3H0DpwISDYrm1eepjOwjk1foe+S2EwXq48I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dlmCToECEuMdVMaLy1wjCa9pL2/ob+BwBgIzw6eO6KFAvjcdVkeDhmKyAU9A63jfv a7B4yS8Fb6acQuDICsTPYjvxERV77uHqnHaORk7WYhXAvshFbaXe8b+ExeP/aUumfc TLY09JCk+cqh8u+qtaO9nzXzkPmBE/8HkZCWwGKiRFfEtCkntYVmOBvab2N2u/kfJm WO/GJzXkXghDMR6ovuoTrkZ2HBYcBBw2hmZk5pWvEH9k2iIwrNFOjEmfqxhK1mGhJA V2ZmLmv4cjBeAXgLaizhQ4XTv93XyryTU3N1GtK3mp6hAHF4mt6KkoeNW2mSXPdN3X KRMFAH16qtoPQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lu Yao , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , Sasha Levin , Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, shashank.sharma@amd.com, Hawking.Zhang@amd.com, srinivasan.shanmugam@amd.com, victorchengchi.lu@amd.com, Praful.Swarnakar@amd.com, le.ma@amd.com, tom.stdenis@amd.com, andrealmeid@igalia.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.15 09/10] drm/amdgpu: Fix cat debugfs amdgpu_regs_didt causes kernel null pointer Date: Mon, 4 Dec 2023 15:36:06 -0500 Message-ID: <20231204203616.2094529-9-sashal@kernel.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231204203616.2094529-1-sashal@kernel.org> References: <20231204203616.2094529-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 5.15.141 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lu Yao [ Upstream commit 2161e09cd05a50d80736fe397145340d2e8f6c05 ] 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. Reviewed-by: Christian König Signed-off-by: Lu Yao Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- 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 beb199d13451b..632d8df04ef45 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c @@ -342,6 +342,9 @@ static ssize_t amdgpu_debugfs_regs_didt_read(struct file *f, char __user *buf, if (size & 0x3 || *pos & 0x3) return -EINVAL; + if (!adev->didt_rreg) + return -EOPNOTSUPP; + r = pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev); @@ -401,6 +404,9 @@ static ssize_t amdgpu_debugfs_regs_didt_write(struct file *f, const char __user if (size & 0x3 || *pos & 0x3) return -EINVAL; + if (!adev->didt_wreg) + return -EOPNOTSUPP; + r = pm_runtime_get_sync(adev_to_drm(adev)->dev); if (r < 0) { pm_runtime_put_autosuspend(adev_to_drm(adev)->dev); -- 2.42.0