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 5BBDEC7EE2A for ; Mon, 22 May 2023 19:42:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235104AbjEVTmP (ORCPT ); Mon, 22 May 2023 15:42:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34330 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235061AbjEVTmM (ORCPT ); Mon, 22 May 2023 15:42:12 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C63F1708 for ; Mon, 22 May 2023 12:41:47 -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 2757362A20 for ; Mon, 22 May 2023 19:41:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36D04C433EF; Mon, 22 May 2023 19:41:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1684784506; bh=7WQMsDnkLJaAHW6RZwpPou3kFutnRgwSnTU7HM1QZHY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GLHQI98761FAHg0NMkTIiUs4KhB2nFExAQpZorHiNOfZxJesf1H2VRXNhGR5ERdzo DWVXPsp8//2jv0j/qOdxxlUvsM1UjoHp94zMHA2NaiHe4nsgV9JwKXTaJeNGAZw5vE nlKkZoE3gszLmm6UT0iwxVOTR7p4DN7H2BjRRv3Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Forza , Dmitry Bogdanov , Mike Christie , Maurizio Lombardi , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 6.3 104/364] scsi: target: iscsit: Free cmds before session free Date: Mon, 22 May 2023 20:06:49 +0100 Message-Id: <20230522190415.360845252@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230522190412.801391872@linuxfoundation.org> References: <20230522190412.801391872@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: Dmitry Bogdanov [ Upstream commit d8990b5a4d065f38f35d69bcd627ec5a7f8330ca ] Commands from recovery entries are freed after session has been closed. That leads to use-after-free at command free or NPE with such call trace: Time2Retain timer expired for SID: 1, cleaning up iSCSI session. BUG: kernel NULL pointer dereference, address: 0000000000000140 RIP: 0010:sbitmap_queue_clear+0x3a/0xa0 Call Trace: target_release_cmd_kref+0xd1/0x1f0 [target_core_mod] transport_generic_free_cmd+0xd1/0x180 [target_core_mod] iscsit_free_cmd+0x53/0xd0 [iscsi_target_mod] iscsit_free_connection_recovery_entries+0x29d/0x320 [iscsi_target_mod] iscsit_close_session+0x13a/0x140 [iscsi_target_mod] iscsit_check_post_dataout+0x440/0x440 [iscsi_target_mod] call_timer_fn+0x24/0x140 Move cleanup of recovery enrties to before session freeing. Reported-by: Forza Signed-off-by: Dmitry Bogdanov Signed-off-by: Mike Christie Link: https://lore.kernel.org/r/20230319015620.96006-7-michael.christie@oracle.com Reviewed-by: Maurizio Lombardi Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/iscsi/iscsi_target.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 3f7a9f7f5f4e3..07e196b44b91d 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -4531,6 +4531,9 @@ int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) iscsit_stop_time2retain_timer(sess); spin_unlock_bh(&se_tpg->session_lock); + if (sess->sess_ops->ErrorRecoveryLevel == 2) + iscsit_free_connection_recovery_entries(sess); + /* * transport_deregister_session_configfs() will clear the * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context @@ -4554,9 +4557,6 @@ int iscsit_close_session(struct iscsit_session *sess, bool can_sleep) transport_deregister_session(sess->se_sess); - if (sess->sess_ops->ErrorRecoveryLevel == 2) - iscsit_free_connection_recovery_entries(sess); - iscsit_free_all_ooo_cmdsns(sess); spin_lock_bh(&se_tpg->session_lock); -- 2.39.2