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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 060D0C636C8 for ; Thu, 22 Jul 2021 03:35:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D688661261 for ; Thu, 22 Jul 2021 03:35:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230439AbhGVCyp (ORCPT ); Wed, 21 Jul 2021 22:54:45 -0400 Received: from mail-pl1-f176.google.com ([209.85.214.176]:33283 "EHLO mail-pl1-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230286AbhGVCyn (ORCPT ); Wed, 21 Jul 2021 22:54:43 -0400 Received: by mail-pl1-f176.google.com with SMTP id d1so2972476plg.0 for ; Wed, 21 Jul 2021 20:35:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YtHjWG741Fo7oeicGEAF+sAbKiOHHBo9FEtRS7qWSZE=; b=W3HfljT7DU7xBkQktqIZlBn6O3wJMuIlS/kui+yGhPDyxx8nKnHT1LsNE/mU1OTHdS aTNSFxYP6uVNV+U9khWJWh1XEDM2xGZLlLJnc8osL+6rx6AiZgcM70f2PpuGHmnq4T0M 8wMXDuQuWw8hK+RAKTeM2QcXJEtHW86S4mrd1nyoKPRapPgdhhM/owMTIfgg3+5a+eBn 4GzXhUh0qYza10Z0RZdSyWikL93H74jcCAVBA97hT0tqDICd4m1ySfJVfKM++ebP/5G+ zsOqN08ODzx5EK5OEJkj4PAWJDltCburqeS5py83HOjM0FPJGQXXcwJZMl864f04He/t NheA== X-Gm-Message-State: AOAM531H/Hofp/iTCnkDTKgr19KFeM+2oFohd9FBrAuL5fKK7t8rnaAL Hi/yY1UHFeu0MrDQW8swqw4= X-Google-Smtp-Source: ABdhPJxAiu+Zidbzdz6RFmLxP7AOg6ehwgpskBIxuHMn04tJa0j616KlnhnN1VTWe9hxmH7yePVzTA== X-Received: by 2002:a65:450d:: with SMTP id n13mr39265765pgq.13.1626924918186; Wed, 21 Jul 2021 20:35:18 -0700 (PDT) Received: from asus.hsd1.ca.comcast.net ([2601:647:4000:d7:30e2:954a:f4a0:3224]) by smtp.gmail.com with ESMTPSA id n6sm32060258pgb.60.2021.07.21.20.35.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 20:35:17 -0700 (PDT) From: Bart Van Assche To: "Martin K . Petersen" Cc: linux-scsi@vger.kernel.org, Jaegeuk Kim , Bart Van Assche , Bean Huo , Avri Altman , Alim Akhtar , "James E.J. Bottomley" , Can Guo , Stanley Chu , Asutosh Das Subject: [PATCH v3 06/18] scsi: ufs: Remove ufshcd_valid_tag() Date: Wed, 21 Jul 2021 20:34:27 -0700 Message-Id: <20210722033439.26550-7-bvanassche@acm.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210722033439.26550-1-bvanassche@acm.org> References: <20210722033439.26550-1-bvanassche@acm.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org scsi_add_host() allocates shost->can_queue tags. ufshcd_init() sets shost->can_queue to hba->nutrs. In other words, we know that tag values will less than hba->nutrs. Hence remove the checks that verify that blk_get_request() returns a tag less than hba->nutrs. This check was introduced by commit 14497328b6a6 ("scsi: ufs: verify command tag validity"). Keep the tag >= 0 check because it helps to detect use-after-free issues. Reviewed-by: Bean Huo CC: Avri Altman Cc: Alim Akhtar Signed-off-by: Bart Van Assche --- drivers/scsi/ufs/ufshcd.c | 42 ++++++++++----------------------------- 1 file changed, 10 insertions(+), 32 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 17afd1b0bd2c..ec12cd4eae03 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -252,11 +252,6 @@ static inline void ufshcd_wb_toggle_flush(struct ufs_hba *hba, bool enable); static void ufshcd_hba_vreg_set_lpm(struct ufs_hba *hba); static void ufshcd_hba_vreg_set_hpm(struct ufs_hba *hba); -static inline bool ufshcd_valid_tag(struct ufs_hba *hba, int tag) -{ - return tag >= 0 && tag < hba->nutrs; -} - static inline void ufshcd_enable_irq(struct ufs_hba *hba) { if (!hba->is_irq_enabled) { @@ -2700,20 +2695,12 @@ static void ufshcd_init_lrb(struct ufs_hba *hba, struct ufshcd_lrb *lrb, int i) */ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd) { + struct ufs_hba *hba = shost_priv(host); + int tag = cmd->request->tag; struct ufshcd_lrb *lrbp; - struct ufs_hba *hba; - int tag; int err = 0; - hba = shost_priv(host); - - tag = cmd->request->tag; - if (!ufshcd_valid_tag(hba, tag)) { - dev_err(hba->dev, - "%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p", - __func__, tag, cmd, cmd->request); - BUG(); - } + WARN_ONCE(tag < 0, "Invalid tag %d\n", tag); if (!down_read_trylock(&hba->clk_scaling_lock)) return SCSI_MLQUEUE_HOST_BUSY; @@ -2967,7 +2954,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba, goto out_unlock; } tag = req->tag; - WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag)); + WARN_ONCE(tag < 0, "Invalid tag %d\n", tag); /* Set the timeout such that the SCSI error handler is not activated. */ req->timeout = msecs_to_jiffies(2 * timeout); blk_mq_start_request(req); @@ -6677,7 +6664,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba, goto out_unlock; } tag = req->tag; - WARN_ON_ONCE(!ufshcd_valid_tag(hba, tag)); + WARN_ONCE(tag < 0, "Invalid tag %d\n", tag); if (unlikely(test_bit(tag, &hba->outstanding_reqs))) { err = -EBUSY; @@ -6979,24 +6966,15 @@ static int ufshcd_try_to_abort_task(struct ufs_hba *hba, int tag) */ static int ufshcd_abort(struct scsi_cmnd *cmd) { - struct Scsi_Host *host; - struct ufs_hba *hba; + struct Scsi_Host *host = cmd->device->host; + struct ufs_hba *hba = shost_priv(host); + unsigned int tag = cmd->request->tag; + struct ufshcd_lrb *lrbp = &hba->lrb[tag]; unsigned long flags; - unsigned int tag; int err = 0; - struct ufshcd_lrb *lrbp; u32 reg; - host = cmd->device->host; - hba = shost_priv(host); - tag = cmd->request->tag; - lrbp = &hba->lrb[tag]; - if (!ufshcd_valid_tag(hba, tag)) { - dev_err(hba->dev, - "%s: invalid command tag %d: cmd=0x%p, cmd->request=0x%p", - __func__, tag, cmd, cmd->request); - BUG(); - } + WARN_ONCE(tag < 0, "Invalid tag %d\n", tag); ufshcd_hold(hba, false); reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);