linux-kernel - Re: [PATCH] drivers/ata: Fix kernel pointer leak

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Date:   Wed, 29 Sep 2021 17:40:07 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Guo Zhi <qtxuning1999@...u.edu.cn>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>
CC:     <linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers/ata: Fix kernel pointer leak



On 29.09.2021 15:16, Guo Zhi wrote:

    I'd recommend the subject prefix to be just "pata_atp867x: "...

> Pointers should be printed with %p or %px rather than cast to
> 'unsigned long' and pinted with %lx

    Printed.

> Change %lx to %p to print the secured pointer.
> 
> Signed-off-by: Guo Zhi <qtxuning1999@...u.edu.cn>
> ---
>   drivers/ata/pata_atp867x.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/ata/pata_atp867x.c b/drivers/ata/pata_atp867x.c
> index 2bc5fc81efe3..c32b95f48e50 100644
> --- a/drivers/ata/pata_atp867x.c
> +++ b/drivers/ata/pata_atp867x.c
> @@ -447,11 +447,11 @@ static int atp867x_ata_pci_sff_init_host(struct ata_host *host)
>   #ifdef	ATP867X_DEBUG
>   		atp867x_check_ports(ap, i);
>   #endif
> -		ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx",
> -			(unsigned long)ioaddr->cmd_addr,
> -			(unsigned long)ioaddr->ctl_addr);
> -		ata_port_desc(ap, "bmdma 0x%lx",
> -			(unsigned long)ioaddr->bmdma_addr);
> +		ata_port_desc(ap, "cmd 0x%p ctl 0x%p",
> +			ioaddr->cmd_addr,

    This line shouldn't be broken up, it's not long at all.

> +			ioaddr->ctl_addr);
> +		ata_port_desc(ap, "bmdma 0x%p",
> +			ioaddr->bmdma_addr);

    Hmm, I've looked at the driver and got an imperession it only uses the I/O 
ports, not MMIO...

[...]

MBR, Sergey