From patchwork Tue Sep 1 15:08:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 264546 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E2A9EC433E6 for ; Tue, 1 Sep 2020 16:42:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B237320767 for ; Tue, 1 Sep 2020 16:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598978550; bh=wljQwHlpf9bp/QI7uHx7YkLy4gyPMzPnNX2OUYwUAy8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=enfUzUrAk4Nf2aRi/y1yStssGLOitABYK+QjO9gO+ZactSLK3+WEjj82WelfphwHU UMn/1enUvFuU1K6IsuKZ8rs05m/euotvc8syxbNHHkYDgN/42FVWEHHOk6iHZ6rquW LCkNCXypVKWB0TgdnsjrIgfH7Tcs2E96vM8HviPs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730334AbgIAQm3 (ORCPT ); Tue, 1 Sep 2020 12:42:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:55784 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730317AbgIAP2A (ORCPT ); Tue, 1 Sep 2020 11:28:00 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1A5DE2078B; Tue, 1 Sep 2020 15:27:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598974078; bh=wljQwHlpf9bp/QI7uHx7YkLy4gyPMzPnNX2OUYwUAy8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e1y+KAD+QK5HywZzhwAEOAvBlk23VlfUIGIvK/dKKZe1TVdllqf4y1ZuhwhX3F2XW eNVmdzc4DEcH+s8M0cjr30p3ClIafYs8l4DRvugTogBpdzJf23kVOpNUZm1gwf6Jhu 9jIxM8n/x7JbOCbrcFU2MHlE2PuEBRa/4+kkBc+I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mike Christie , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.4 036/214] scsi: target: Fix xcopy sess release leak Date: Tue, 1 Sep 2020 17:08:36 +0200 Message-Id: <20200901150954.695194395@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200901150952.963606936@linuxfoundation.org> References: <20200901150952.963606936@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mike Christie [ Upstream commit 3c006c7d23aac928279f7cbe83bbac4361255d53 ] transport_init_session can allocate memory via percpu_ref_init, and target_xcopy_release_pt never frees it. This adds a transport_uninit_session function to handle cleanup of resources allocated in the init function. Link: https://lore.kernel.org/r/1593654203-12442-3-git-send-email-michael.christie@oracle.com Signed-off-by: Mike Christie Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/target_core_internal.h | 1 + drivers/target/target_core_transport.c | 7 ++++++- drivers/target/target_core_xcopy.c | 11 +++++++++-- 3 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/target/target_core_internal.h b/drivers/target/target_core_internal.h index 8533444159635..e7b3c6e5d5744 100644 --- a/drivers/target/target_core_internal.h +++ b/drivers/target/target_core_internal.h @@ -138,6 +138,7 @@ int init_se_kmem_caches(void); void release_se_kmem_caches(void); u32 scsi_get_new_index(scsi_index_t); void transport_subsystem_check_init(void); +void transport_uninit_session(struct se_session *); unsigned char *transport_dump_cmd_direction(struct se_cmd *); void transport_dump_dev_state(struct se_device *, char *, int *); void transport_dump_dev_info(struct se_device *, struct se_lun *, diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index 7c78a5d02c083..b1f4be055f838 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -236,6 +236,11 @@ int transport_init_session(struct se_session *se_sess) } EXPORT_SYMBOL(transport_init_session); +void transport_uninit_session(struct se_session *se_sess) +{ + percpu_ref_exit(&se_sess->cmd_count); +} + /** * transport_alloc_session - allocate a session object and initialize it * @sup_prot_ops: bitmask that defines which T10-PI modes are supported. @@ -579,7 +584,7 @@ void transport_free_session(struct se_session *se_sess) sbitmap_queue_free(&se_sess->sess_tag_pool); kvfree(se_sess->sess_cmd_map); } - percpu_ref_exit(&se_sess->cmd_count); + transport_uninit_session(se_sess); kmem_cache_free(se_sess_cache, se_sess); } EXPORT_SYMBOL(transport_free_session); diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c index b9b1e92c6f8db..9d24e85b08631 100644 --- a/drivers/target/target_core_xcopy.c +++ b/drivers/target/target_core_xcopy.c @@ -479,7 +479,7 @@ int target_xcopy_setup_pt(void) memset(&xcopy_pt_sess, 0, sizeof(struct se_session)); ret = transport_init_session(&xcopy_pt_sess); if (ret < 0) - return ret; + goto destroy_wq; xcopy_pt_nacl.se_tpg = &xcopy_pt_tpg; xcopy_pt_nacl.nacl_sess = &xcopy_pt_sess; @@ -488,12 +488,19 @@ int target_xcopy_setup_pt(void) xcopy_pt_sess.se_node_acl = &xcopy_pt_nacl; return 0; + +destroy_wq: + destroy_workqueue(xcopy_wq); + xcopy_wq = NULL; + return ret; } void target_xcopy_release_pt(void) { - if (xcopy_wq) + if (xcopy_wq) { destroy_workqueue(xcopy_wq); + transport_uninit_session(&xcopy_pt_sess); + } } /*