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 9C8AAC54EBC for ; Tue, 10 Jan 2023 18:21:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239229AbjAJSVr (ORCPT ); Tue, 10 Jan 2023 13:21:47 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239224AbjAJSVU (ORCPT ); Tue, 10 Jan 2023 13:21:20 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F75796132 for ; Tue, 10 Jan 2023 10:19:04 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A1DBC61846 for ; Tue, 10 Jan 2023 18:19:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B234AC433EF; Tue, 10 Jan 2023 18:19:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673374743; bh=1kWbMsaTYrYA+ClJ3yAOD06gUm4odCYDxQnfopTjvdA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gnioLaFwtHT7Og55b0cn0tgavo6K05pmds0MfSAerIbQ2zQmR4NZPD2MJb/Ogm/0Z RnKD6byf6hrLt+b+GASRE5DEy3oM914A10HPhf2XQCmyPpC1IOCHPOZ9UVNvDGCPQt u+ry1ohzxWZcgPRgh8/esW3Bhe7NAHlfTU9J34kU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zheng Wang , Zhenyu Wang , Sasha Levin Subject: [PATCH 6.1 101/159] drm/i915/gvt: fix double free bug in split_2MB_gtt_entry Date: Tue, 10 Jan 2023 19:04:09 +0100 Message-Id: <20230110180021.498907346@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230110180018.288460217@linuxfoundation.org> References: <20230110180018.288460217@linuxfoundation.org> User-Agent: quilt/0.67 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 From: Zheng Wang [ Upstream commit 4a61648af68f5ba4884f0e3b494ee1cabc4b6620 ] If intel_gvt_dma_map_guest_page failed, it will call ppgtt_invalidate_spt, which will finally free the spt. But the caller function ppgtt_populate_spt_by_guest_entry does not notice that, it will free spt again in its error path. Fix this by canceling the mapping of DMA address and freeing sub_spt. Besides, leave the handle of spt destroy to caller function instead of callee function when error occurs. Fixes: b901b252b6cf ("drm/i915/gvt: Add 2M huge gtt support") Signed-off-by: Zheng Wang Reviewed-by: Zhenyu Wang Signed-off-by: Zhenyu Wang Link: http://patchwork.freedesktop.org/patch/msgid/20221229165641.1192455-1-zyytlz.wz@163.com Signed-off-by: Sasha Levin --- drivers/gpu/drm/i915/gvt/gtt.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/i915/gvt/gtt.c b/drivers/gpu/drm/i915/gvt/gtt.c index ce0eb03709c3..80c60754a5c1 100644 --- a/drivers/gpu/drm/i915/gvt/gtt.c +++ b/drivers/gpu/drm/i915/gvt/gtt.c @@ -1214,10 +1214,8 @@ static int split_2MB_gtt_entry(struct intel_vgpu *vgpu, for_each_shadow_entry(sub_spt, &sub_se, sub_index) { ret = intel_gvt_dma_map_guest_page(vgpu, start_gfn + sub_index, PAGE_SIZE, &dma_addr); - if (ret) { - ppgtt_invalidate_spt(spt); - return ret; - } + if (ret) + goto err; sub_se.val64 = se->val64; /* Copy the PAT field from PDE. */ @@ -1236,6 +1234,17 @@ static int split_2MB_gtt_entry(struct intel_vgpu *vgpu, ops->set_pfn(se, sub_spt->shadow_page.mfn); ppgtt_set_shadow_entry(spt, se, index); return 0; +err: + /* Cancel the existing addess mappings of DMA addr. */ + for_each_present_shadow_entry(sub_spt, &sub_se, sub_index) { + gvt_vdbg_mm("invalidate 4K entry\n"); + ppgtt_invalidate_pte(sub_spt, &sub_se); + } + /* Release the new allocated spt. */ + trace_spt_change(sub_spt->vgpu->id, "release", sub_spt, + sub_spt->guest_page.gfn, sub_spt->shadow_page.type); + ppgtt_free_spt(sub_spt); + return ret; } static int split_64KB_gtt_entry(struct intel_vgpu *vgpu, -- 2.35.1