[PATCH v3] 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 <redacted>
Reviewed-by: Stanley Chu <redacted>
Signed-off-by: Can Guo <redacted>
---

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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On Wed, Jun 09, 2021 at 01:24:00AM -0700, Can Guo wrote:

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 <redacted>
Reviewed-by: Stanley Chu <redacted>
Signed-off-by: Can Guo <redacted>

Reviewed-by: Nathan Chancellor <nathan@kernel.org>

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On Wed, 9 Jun 2021 01:24:00 -0700, Can Guo wrote:

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

Applied to 5.14/scsi-queue, thanks!

[1/1] scsi: ufs: Fix a possible use before initialization case
      https://git.kernel.org/mkp/scsi/c/eb783bb8bbe7

-- 
Martin K. Petersen	Oracle Linux Engineering

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