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 DD628C43219 for ; Wed, 23 Nov 2022 09:37:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237897AbiKWJh4 (ORCPT ); Wed, 23 Nov 2022 04:37:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57392 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237926AbiKWJhY (ORCPT ); Wed, 23 Nov 2022 04:37:24 -0500 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 759EE6148 for ; Wed, 23 Nov 2022 01:35:18 -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 sin.source.kernel.org (Postfix) with ESMTPS id 968B9CE20E5 for ; Wed, 23 Nov 2022 09:35:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4CF6DC433D6; Wed, 23 Nov 2022 09:35:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1669196113; bh=y95hiEpU1E+Mm0GKGD7ZvHT8vZFZLFP4ZwJuKsKkSBs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qQNL5IOa4S3Q3p9w68apRWWrFVPe75k9EMqvhBlnfeRJH81y8iMY1x8QMVJbPimXP mwb4XvWwdDgExL5STmIj+gPsfHQveNnp4ZHUEtk1ndtYMDApschs/2rf5biyoL4uFJ EGE+iB6li/qPyxcZVDBkV99YMzfTz1N/phJramso= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= , Jens Axboe , Sasha Levin Subject: [PATCH 5.15 096/181] drbd: use after free in drbd_create_device() Date: Wed, 23 Nov 2022 09:50:59 +0100 Message-Id: <20221123084606.478755160@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123084602.707860461@linuxfoundation.org> References: <20221123084602.707860461@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: Dan Carpenter [ Upstream commit a7a1598189228b5007369a9622ccdf587be0730f ] The drbd_destroy_connection() frees the "connection" so use the _safe() iterator to prevent a use after free. Fixes: b6f85ef9538b ("drbd: Iterate over all connections") Signed-off-by: Dan Carpenter Reviewed-by: Christoph Böhmwalder Link: https://lore.kernel.org/r/Y3Jd5iZRbNQ9w6gm@kili Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/block/drbd/drbd_main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index d59af26d7703..f4e38c208b9f 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -2699,7 +2699,7 @@ static int init_submitter(struct drbd_device *device) enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor) { struct drbd_resource *resource = adm_ctx->resource; - struct drbd_connection *connection; + struct drbd_connection *connection, *n; struct drbd_device *device; struct drbd_peer_device *peer_device, *tmp_peer_device; struct gendisk *disk; @@ -2815,7 +2815,7 @@ enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsig return NO_ERROR; out_idr_remove_from_resource: - for_each_connection(connection, resource) { + for_each_connection_safe(connection, n, resource) { peer_device = idr_remove(&connection->peer_devices, vnr); if (peer_device) kref_put(&connection->kref, drbd_destroy_connection); -- 2.35.1