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 F3029C433EF for ; Wed, 20 Jul 2022 01:25:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241941AbiGTBZd (ORCPT ); Tue, 19 Jul 2022 21:25:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57980 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241977AbiGTBYT (ORCPT ); Tue, 19 Jul 2022 21:24:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5A8A735BE; Tue, 19 Jul 2022 18:17:21 -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 7D55961831; Wed, 20 Jul 2022 01:17:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A216C341D5; Wed, 20 Jul 2022 01:17:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1658279839; bh=EJ42gwPelp1i8y77jY6L1SXXMBbPs+OVvTVdu5paoJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DhPBu9bHHV+zUHLShgv3u9txjD2fwtmiS7sq1BEoPnMSu3FJFzBClFpxTwfj4BV9I oVJoyvd6wHW1tHyDQc3VMuGEJXZG804m8TldLvbhS3VadgEMNJIRBGaB+/DwG177dM YUFhEKunS41QjqGzRE/8LuN2SmhmoFaGsLYR3khc2bLnLRoHQX7NB2zn1xHiYGF8e7 YZwnoFQEDIHBmHfKWLVr4znwm5NRbiR5I1T8EEb9GL+/fdKa/OKuTmaEnRMmaSp658 HgcbQEvwmLEW9Q8bSrbNMZ8SFROlc8fRYGpVFvavXyLMH30RSwud6F4qvFj9SsTX95 W7oawZX2pYx3g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mike Christie , Christoph Hellwig , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org, target-devel@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 20/25] scsi: target: Fix WRITE_SAME No Data Buffer crash Date: Tue, 19 Jul 2022 21:16:11 -0400 Message-Id: <20220720011616.1024753-20-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220720011616.1024753-1-sashal@kernel.org> References: <20220720011616.1024753-1-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: linux-kernel@vger.kernel.org From: Mike Christie [ Upstream commit ccd3f449052449a917a3e577d8ba0368f43b8f29 ] In newer version of the SBC specs, we have a NDOB bit that indicates there is no data buffer that gets written out. If this bit is set using commands like "sg_write_same --ndob" we will crash in target_core_iblock/file's execute_write_same handlers when we go to access the se_cmd->t_data_sg because its NULL. This patch adds a check for the NDOB bit in the common WRITE SAME code because we don't support it. And, it adds a check for zero SG elements in each handler in case the initiator tries to send a normal WRITE SAME with no data buffer. Link: https://lore.kernel.org/r/20220628022325.14627-2-michael.christie@oracle.com Reviewed-by: Christoph Hellwig Signed-off-by: Mike Christie Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/target_core_file.c | 3 +++ drivers/target/target_core_iblock.c | 4 ++++ drivers/target/target_core_sbc.c | 6 ++++++ 3 files changed, 13 insertions(+) diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 7143d03f0e02..b20f842bcfbc 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -455,6 +455,9 @@ fd_execute_write_same(struct se_cmd *cmd) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } + if (!cmd->t_data_nents) + return TCM_INVALID_CDB_FIELD; + if (cmd->t_data_nents > 1 || cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index f2bd2e207e0b..db4f1ae3d6fc 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -458,6 +458,10 @@ iblock_execute_write_same(struct se_cmd *cmd) " backends not supported\n"); return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; } + + if (!cmd->t_data_nents) + return TCM_INVALID_CDB_FIELD; + sg = &cmd->t_data_sg[0]; if (cmd->t_data_nents > 1 || diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c index eaf8551ebc61..c001f14645a4 100644 --- a/drivers/target/target_core_sbc.c +++ b/drivers/target/target_core_sbc.c @@ -312,6 +312,12 @@ sbc_setup_write_same(struct se_cmd *cmd, unsigned char flags, struct sbc_ops *op pr_warn("WRITE SAME with ANCHOR not supported\n"); return TCM_INVALID_CDB_FIELD; } + + if (flags & 0x01) { + pr_warn("WRITE SAME with NDOB not supported\n"); + return TCM_INVALID_CDB_FIELD; + } + /* * Special case for WRITE_SAME w/ UNMAP=1 that ends up getting * translated into block discard requests within backend code. -- 2.35.1