linux-kernel - Re: [PATCH v3] scsi: ufs: Fix a possible use before initialization case

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Message-ID: <YMD5xoeiE7+wrCEK@archlinux-ax161>
Date:   Wed, 9 Jun 2021 10:26:30 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Can Guo <cang@...eaurora.org>
Cc:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, ziqichen@...eaurora.org,
        linux-scsi@...r.kernel.org, kernel-team@...roid.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>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v3] scsi: ufs: Fix a possible use before initialization
 case

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 <lkp@...el.com>
> Reviewed-by: Stanley Chu <stanley.chu@...iatek.com>
> Signed-off-by: Can Guo <cang@...eaurora.org>

Reviewed-by: Nathan Chancellor <nathan@...nel.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.
>