From patchwork Mon May 16 19:35:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 573347 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 CF61FC433F5 for ; Mon, 16 May 2022 19:54:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346486AbiEPTyM (ORCPT ); Mon, 16 May 2022 15:54:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56740 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348364AbiEPTws (ORCPT ); Mon, 16 May 2022 15:52:48 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6EA0745AD7; Mon, 16 May 2022 12:48:27 -0700 (PDT) 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 11B1D60ABE; Mon, 16 May 2022 19:48:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E10FC385AA; Mon, 16 May 2022 19:48:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652730504; bh=8TNGV8+lcfjcP2CucebFTBrC3MWqsBcqoaEeKvVh1+s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j7l++uub0o+dvbubSFoWemRDAd8yYmYLpZV+8fs4Ayhx4UbSQsc9BPMglEYyfEuSK 1FY6af/AD5Y0ierG1RLfOjIlvd8kNXdCSdaZN90iRigPBWqf5VJ2/RKbRU8/qmfW5m aPqTJDyUxETJhNuj5ev9Wm9R9wtW/AdCdqx1pCBg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Andrzej Hajda , Javier Martinez Canillas , Andi Shyti , Thomas Zimmermann , Lucas De Marchi , Sasha Levin Subject: [PATCH 5.15 020/102] fbdev: efifb: Fix a use-after-free due early fb_info cleanup Date: Mon, 16 May 2022 21:35:54 +0200 Message-Id: <20220516193624.580066845@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220516193623.989270214@linuxfoundation.org> References: <20220516193623.989270214@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Javier Martinez Canillas [ Upstream commit 1b5853dfab7fdde450f00f145327342238135c8a ] Commit d258d00fb9c7 ("fbdev: efifb: Cleanup fb_info in .fb_destroy rather than .remove") attempted to fix a use-after-free error due driver freeing the fb_info in the .remove handler instead of doing it in .fb_destroy. But ironically that change introduced yet another use-after-free since the fb_info was still used after the free. This should fix for good by freeing the fb_info at the end of the handler. Fixes: d258d00fb9c7 ("fbdev: efifb: Cleanup fb_info in .fb_destroy rather than .remove") Reported-by: Ville Syrjälä Reported-by: Andrzej Hajda Signed-off-by: Javier Martinez Canillas Reviewed-by: Andi Shyti Reviewed-by: Andrzej Hajda Reviewed-by: Thomas Zimmermann Signed-off-by: Lucas De Marchi Link: https://patchwork.freedesktop.org/patch/msgid/20220506132225.588379-1-javierm@redhat.com Signed-off-by: Sasha Levin --- drivers/video/fbdev/efifb.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index cfa3dc0b4eee..b3d5f884c544 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -259,12 +259,12 @@ static void efifb_destroy(struct fb_info *info) memunmap(info->screen_base); } - framebuffer_release(info); - if (request_mem_succeeded) release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size); fb_dealloc_cmap(&info->cmap); + + framebuffer_release(info); } static const struct fb_ops efifb_ops = {