linux-kernel - Re: [PATCH] scsi: ufs: fix memory boundary check for UFS 3.0

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Message-ID: <X9PaCUbaIFhsKgc7@gmail.com>
Date:   Fri, 11 Dec 2020 12:43:53 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, cang@...eaurora.org,
        alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        martin.petersen@...cle.com, stanley.chu@...iatek.com,
        Jaegeuk Kim <jaegeuk@...gle.com>
Subject: Re: [PATCH] scsi: ufs: fix memory boundary check for UFS 3.0

On Fri, Dec 11, 2020 at 11:38:14AM -0800, Jaegeuk Kim wrote:
> From: Jaegeuk Kim <jaegeuk@...gle.com>
> 
> If param_offset is greater than what UFS supports, it'll give kernel panic.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@...gle.com>
> Change-Id: I48ea6f3f3074bd42abf4ecf8be87806732f3e6a3
> ---
>  drivers/scsi/ufs/ufshcd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index d6a3a0ba6960..04687661d0df 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3194,6 +3194,9 @@ int ufshcd_read_desc_param(struct ufs_hba *hba,
>  		return -EINVAL;
>  	}
>  
> +	if (param_offset > buff_len)
> +		return -EINVAL;
> +
>  	/* Check whether we need temp memory */
>  	if (param_offset != 0 || param_size < buff_len) {
>  		desc_buf = kmalloc(buff_len, GFP_KERNEL);
> -- 

Didn't this already get fixed by:

	commit 1699f980d87fb678a669490462cf0b9517c1fb47
	Author: Can Guo <cang@...eaurora.org>
	Date:   Wed Oct 21 22:59:00 2020 -0700

	    scsi: ufs: Fix unexpected values from ufshcd_read_desc_param()