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 X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 35DDBC4160E for ; Wed, 3 Mar 2021 00:36:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B7F864FB2 for ; Wed, 3 Mar 2021 00:36:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238141AbhCCA0f (ORCPT ); Tue, 2 Mar 2021 19:26:35 -0500 Received: from mail.kernel.org ([198.145.29.99]:46964 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243781AbhCBMVD (ORCPT ); Tue, 2 Mar 2021 07:21:03 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id EF2AD64F9E; Tue, 2 Mar 2021 11:58:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614686313; bh=6P3DdLPWv+SetLoqWfY9WvKMTmuyUr0/wnonRclgA4Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S9XvS3m+ZtlBXURfRk9yvKp/ff18vdGo/gEks9HOpib+WP7Mzui4CNZT4wys1Kc5l lMLx31JhCqZI4hdinps5qI7FoA/5YkVvDvtyO84hq6vCW7d5k0MF/OPjflpL5wY/aC HVp6D3GQReVc+rblka7Ukwf/jCcAyvq0Bqx2YFbTgm4Dc6Ym1UyV6yU5Ug6gUEisyB HBvFxUcH63mqzuKFtJ4CalvaB+oH04YAzQWCsrnBIwdYZLHmcdJuTVJV58bws2Hl0n YNRC7L+aM3gEFcGIyPW8dVewv8Rg9t4cw88PHwjPtS4HLH4RzNzrFjOvmVjx1s4EIZ whdxIdZ/OBZuA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Aleksandr Miloserdov , Roman Bolshakov , Bodo Stroesser , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, bcm-kernel-feedback-list@broadcom.com Subject: [PATCH AUTOSEL 5.4 32/33] scsi: target: core: Add cmd length set before cmd complete Date: Tue, 2 Mar 2021 06:57:48 -0500 Message-Id: <20210302115749.62653-32-sashal@kernel.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210302115749.62653-1-sashal@kernel.org> References: <20210302115749.62653-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Aleksandr Miloserdov [ Upstream commit 1c73e0c5e54d5f7d77f422a10b03ebe61eaed5ad ] TCM doesn't properly handle underflow case for service actions. One way to prevent it is to always complete command with target_complete_cmd_with_length(), however it requires access to data_sg, which is not always available. This change introduces target_set_cmd_data_length() function which allows to set command data length before completing it. Link: https://lore.kernel.org/r/20210209072202.41154-2-a.miloserdov@yadro.com Reviewed-by: Roman Bolshakov Reviewed-by: Bodo Stroesser Signed-off-by: Aleksandr Miloserdov Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/target_core_transport.c | 15 +++++++++++---- include/target/target_core_backend.h | 1 + 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c index b1f4be055f83..a16835c0bb1d 100644 --- a/drivers/target/target_core_transport.c +++ b/drivers/target/target_core_transport.c @@ -873,11 +873,9 @@ void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status) } EXPORT_SYMBOL(target_complete_cmd); -void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) +void target_set_cmd_data_length(struct se_cmd *cmd, int length) { - if ((scsi_status == SAM_STAT_GOOD || - cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) && - length < cmd->data_length) { + if (length < cmd->data_length) { if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { cmd->residual_count += cmd->data_length - length; } else { @@ -887,6 +885,15 @@ void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int len cmd->data_length = length; } +} +EXPORT_SYMBOL(target_set_cmd_data_length); + +void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length) +{ + if (scsi_status == SAM_STAT_GOOD || + cmd->se_cmd_flags & SCF_TREAT_READ_AS_NORMAL) { + target_set_cmd_data_length(cmd, length); + } target_complete_cmd(cmd, scsi_status); } diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h index 51b6f50eabee..0deeff9b4496 100644 --- a/include/target/target_core_backend.h +++ b/include/target/target_core_backend.h @@ -69,6 +69,7 @@ int transport_backend_register(const struct target_backend_ops *); void target_backend_unregister(const struct target_backend_ops *); void target_complete_cmd(struct se_cmd *, u8); +void target_set_cmd_data_length(struct se_cmd *, int); void target_complete_cmd_with_length(struct se_cmd *, u8, int); void transport_copy_sense_to_cmd(struct se_cmd *, unsigned char *); -- 2.30.1