[PATCH v3] scsi: ufs: Fix a possible use before initialization case

From: Can Guo <cang@codeaurora.org>
To: asutoshd@codeaurora.org, nguyenb@codeaurora.org,
	hongwus@codeaurora.org, ziqichen@codeaurora.org,
	linux-scsi@vger.kernel.org, kernel-team@android.com,
	cang@codeaurora.org
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
	Avri Altman <avri.altman@wdc.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Stanley Chu <stanley.chu@mediatek.com>,
	Bean Huo <beanhuo@micron.com>, Jaegeuk Kim <jaegeuk@kernel.org>,
	linux-kernel@vger.kernel.org (open list),
	linux-arm-kernel@lists.infradead.org (moderated
	list:ARM/Mediatek SoC support),
	linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek
	SoC support)
Subject: [PATCH v3] scsi: ufs: Fix a possible use before initialization case
Date: Wed,  9 Jun 2021 01:24:00 -0700	[thread overview]
Message-ID: <1623227044-22635-1-git-send-email-cang@codeaurora.org> (raw)

In ufshcd_exec_dev_cmd(), if error happens before lrpb is initialized,
then we should bail out instead of letting trace record the error.

Fixes: a45f937110fa6 ("scsi: ufs: Optimize host lock on transfer requests send/compl paths")
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
---

Change since V2:
- Removed unused goto out_put_tag

Change since V1:
- Use codeaurora mail in Signed-off-by tag

 drivers/scsi/ufs/ufshcd.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index fe1b5f4..25fe18a 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2980,7 +2980,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 	WARN_ON(lrbp->cmd);
 	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
 	if (unlikely(err))
-		goto out_put_tag;
+		goto out;
 
 	hba->dev_cmd.complete = &wait;
 
@@ -2990,11 +2990,10 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 
 	ufshcd_send_command(hba, tag);
 	err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
-out:
 	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
 				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
 
-out_put_tag:
+out:
 	blk_put_request(req);
 out_unlock:
 	up_read(&hba->clk_scaling_lock);
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.


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