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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4ACEDC25B76 for ; Wed, 5 Jun 2024 12:05:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 93B5C10E7A1; Wed, 5 Jun 2024 12:05:26 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="m4KDWDzv"; dkim-atps=neutral Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by gabe.freedesktop.org (Postfix) with ESMTPS id 3886C10E7A2; Wed, 5 Jun 2024 12:05:21 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 844C6CE1773; Wed, 5 Jun 2024 12:05:19 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F12EBC32781; Wed, 5 Jun 2024 12:05:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1717589118; bh=qQuitPoq93Dql+IO0stmpexe7lWd2SiPR91hJ0WDJ/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=m4KDWDzv78u4Qc5Lss1IhyGHk6z/lbEuJiS5k9O0oaDV5eLVC2+5cAjRqpHVP9tRi y1YJLHqK39A551DJsgLkna3D5INDkS9azzdAD99dohCvL4hM9By6a/C6/x7uJ/grbb EMbtz5wYWqrn+X694968tOaBgKGhr1lu6OpNujZBJV/EuGFI60bQqwXOeSHZouEf3a 9aQtg497ASk6aJHZo6PAcp4hwnV5qvk1zp43gdNTRDn74JCKL0GRMDfg8U47gBn7aT ctmvDFBoWsKA84KR5XmoyuehfWCnscgz6t2O1r1l9mFXrP12+H03gv+wYaaxV7Yh8y CCx4JWy6LLdYw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jesse Zhang , Jesse Zhang , =?UTF-8?q?Christian=20K=C3=B6nig?= , Alex Deucher , Sasha Levin , Xinhui.Pan@amd.com, airlied@gmail.com, daniel@ffwll.ch, Felix.Kuehling@amd.com, shashank.sharma@amd.com, guchun.chen@amd.com, Philip.Yang@amd.com, mukul.joshi@amd.com, xiaogang.chen@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 6.1 13/14] drm/amdgpu: fix dereference null return value for the function amdgpu_vm_pt_parent Date: Wed, 5 Jun 2024 08:04:46 -0400 Message-ID: <20240605120455.2967445-13-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240605120455.2967445-1-sashal@kernel.org> References: <20240605120455.2967445-1-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 6.1.92 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: Jesse Zhang [ Upstream commit a0cf36546cc24ae1c95d72253c7795d4d2fc77aa ] The pointer parent may be NULLed by the function amdgpu_vm_pt_parent. To make the code more robust, check the pointer parent. Signed-off-by: Jesse Zhang Suggested-by: Christian König Reviewed-by: Christian König Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c index 69b3829bbe53f..370d02bdde862 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c @@ -754,11 +754,15 @@ int amdgpu_vm_pde_update(struct amdgpu_vm_update_params *params, struct amdgpu_vm_bo_base *entry) { struct amdgpu_vm_bo_base *parent = amdgpu_vm_pt_parent(entry); - struct amdgpu_bo *bo = parent->bo, *pbo; + struct amdgpu_bo *bo, *pbo; struct amdgpu_vm *vm = params->vm; uint64_t pde, pt, flags; unsigned int level; + if (WARN_ON(!parent)) + return -EINVAL; + + bo = parent->bo; for (level = 0, pbo = bo->parent; pbo; ++level) pbo = pbo->parent; -- 2.43.0