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 36611CD37BB for ; Sat, 16 Sep 2023 12:30:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235068AbjIPM3k (ORCPT ); Sat, 16 Sep 2023 08:29:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239236AbjIPM3X (ORCPT ); Sat, 16 Sep 2023 08:29:23 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 631A0194 for ; Sat, 16 Sep 2023 05:29:18 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F96AC433C7; Sat, 16 Sep 2023 12:29:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1694867358; bh=e9oKWmZvEMSCev/icou4v11MoGvgWZ7XdaV7dVmMlN8=; h=Subject:To:Cc:From:Date:From; b=KAnWdzswbYJUD+x7yDtvbdycPBQOyAlJR3OBTSkdvEoM60iifVDWY9ZMtCEAxl7O8 GhRccfT5TxvpZ+xpU1lbH1NUk3N8nbEWsd1SWqQcPihEF5UmPKyLgMVlbNSVXgn/UU nTqQq/Tei6OlZyEWgVzWdZuGokayLBgC3ZQwG/e0= Subject: FAILED: patch "[PATCH] drm/amdgpu: fix amdgpu_cs_p1_user_fence" failed to apply to 6.5-stable tree To: christian.koenig@amd.com, alexander.deucher@amd.com Cc: From: Date: Sat, 16 Sep 2023 14:29:15 +0200 Message-ID: <2023091615-wick-punch-6c68@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 6.5-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.5.y git checkout FETCH_HEAD git cherry-pick -x 35588314e963938dfdcdb792c9170108399377d6 # git commit -s git send-email --to '' --in-reply-to '2023091615-wick-punch-6c68@gregkh' --subject-prefix 'PATCH 6.5.y' HEAD^.. Possible dependencies: 35588314e963 ("drm/amdgpu: fix amdgpu_cs_p1_user_fence") ca6c1e210aa7 ("drm/amdgpu: use the new drm_exec object for CS v3") 8abc1eb2987a ("drm/amdkfd: switch over to using drm_exec v3") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 35588314e963938dfdcdb792c9170108399377d6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Fri, 25 Aug 2023 15:28:00 +0200 Subject: [PATCH] drm/amdgpu: fix amdgpu_cs_p1_user_fence MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The offset is just 32bits here so this can potentially overflow if somebody specifies a large value. Instead reduce the size to calculate the last possible offset. The error handling path incorrectly drops the reference to the user fence BO resulting in potential reference count underflow. Signed-off-by: Christian König Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c index 49dd9aa8da70..efdb1c48f431 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c @@ -127,7 +127,6 @@ static int amdgpu_cs_p1_user_fence(struct amdgpu_cs_parser *p, { struct drm_gem_object *gobj; unsigned long size; - int r; gobj = drm_gem_object_lookup(p->filp, data->handle); if (gobj == NULL) @@ -137,23 +136,14 @@ static int amdgpu_cs_p1_user_fence(struct amdgpu_cs_parser *p, drm_gem_object_put(gobj); size = amdgpu_bo_size(p->uf_bo); - if (size != PAGE_SIZE || (data->offset + 8) > size) { - r = -EINVAL; - goto error_unref; - } + if (size != PAGE_SIZE || data->offset > (size - 8)) + return -EINVAL; - if (amdgpu_ttm_tt_get_usermm(p->uf_bo->tbo.ttm)) { - r = -EINVAL; - goto error_unref; - } + if (amdgpu_ttm_tt_get_usermm(p->uf_bo->tbo.ttm)) + return -EINVAL; *offset = data->offset; - return 0; - -error_unref: - amdgpu_bo_unref(&p->uf_bo); - return r; } static int amdgpu_cs_p1_bo_handles(struct amdgpu_cs_parser *p,