linux-kernel - Re: [PATCH 3/4] misc: xilinx_sdfec: Prevent a divide by zero in xsdfec_reg0

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 22 Aug 2019 10:18:20 +0200
From:   Michal Simek <michal.simek@...inx.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Derek Kiernan <derek.kiernan@...inx.com>,
        Dragan Cvetic <dragan.cvetic@...inx.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 3/4] misc: xilinx_sdfec: Prevent a divide by zero in
 xsdfec_reg0_write()

On 21. 08. 19 9:09, Dan Carpenter wrote:
> The "psize" value comes from the user so we need to verify that it's
> non-zero before we check if "n % psize" or it will crash.
> 
> Fixes: 20ec628e8007 ("misc: xilinx_sdfec: Add ability to configure LDPC")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> The parentheses in this condition are a no-op.  They're just confusing.
> Perhaps something else was intended?
> 
>  drivers/misc/xilinx_sdfec.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
> index 813b82c59360..3fc53d20abf3 100644
> --- a/drivers/misc/xilinx_sdfec.c
> +++ b/drivers/misc/xilinx_sdfec.c
> @@ -460,7 +460,7 @@ static int xsdfec_reg0_write(struct xsdfec_dev *xsdfec, u32 n, u32 k, u32 psize,
>  {
>  	u32 wdata;
>  
> -	if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX ||
> +	if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX || psize == 0 ||
>  	    (n > XSDFEC_REG0_N_MUL_P * psize) || n <= k || ((n % psize) != 0)) {
>  		dev_dbg(xsdfec->dev, "N value is not in range");
>  		return -EINVAL;
> 

Reviewed-by: Michal Simek <michal.simek@...inx.com>

Thanks,
Michal