linux-kernel - [PATCH] scsi: ufs: Fix a possible use before initialization case

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Message-Id: <1623209820-37840-1-git-send-email-cang@qti.qualcomm.com>
Date:   Tue,  8 Jun 2021 20:36:50 -0700
From:   Can Guo <cang@....qualcomm.com>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.com,
        cang@...eaurora.org
Cc:     Can Guo <cang@....qualcomm.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] scsi: ufs: Fix a possible use before initialization case

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@...el.com>
Signed-off-by: Can Guo <cang@....qualcomm.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index fe1b5f4..0d54ab7 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2972,7 +2972,7 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 
 	if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
 		err = -EBUSY;
-		goto out;
+		goto out_put_tag;
 	}
 
 	init_completion(&wait);
-- 
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