linux-kernel - Re: drivers/net/ethernet/nvidia/forcedeth.c saved_config

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Message-ID: <5230BA0A.6020903@cogentembedded.com>
Date:	Wed, 11 Sep 2013 22:44:26 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Marc Weber <marco-oweber@....de>
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Kosina <jkosina@...e.cz>
Subject: Re: drivers/net/ethernet/nvidia/forcedeth.c saved_config_space[size]
 access patch

Hello.

On 09/09/2013 03:39 AM, Marc Weber wrote:

>    1) VER3 and _MAX are of same size:
>    #define NV_PCI_REGSZ_VER3       0x604
>    #define NV_PCI_REGSZ_MAX        0x604


>    2) It looks like there is a case where VER3 get's assigned to
>        register_size:

>    if (id->driver_data &
>    (DEV_HAS_VLAN|DEV_HAS_MSI_X|DEV_HAS_POWER_CNTRL|DEV_HAS_STATISTICS_V2|DEV_HAS_STATISTICS_V
>                    np->register_size = NV_PCI_REGSZ_VER3;

>    3) the definition of saved_config_space is MAX divided by 4 (size of u32)
>    struct fe_priv {
>      [...]
>      u32 saved_config_space[NV_PCI_REGSZ_MAX/4]

>    4) This doesn't stop loop at [size-1]:
>      Thus there is the risk that it overrides the field after
>      saved_config_space. If that's desired behaviour at least a comment
>      is missing IMHO:

>    for (i = 0; i <= np->register_size/sizeof(u32); i++)
>       np->saved_config_space[i] = readl(base + i*sizeof(u32));

>    Such for loop is used twice in forcedeth.c

> Patch againstn 4de9ad9bc08 (Fri Sep 6 11:14:33) attached fixing both
> using < instead of <=.

> If you think I've hit a small bug just fix and commit.
> I don't care much about my ownership of this patch.

> I didn't test this patch because I don't have the hardware and I think
> its a trivial case.

    Don't attach the patches, send them inline instead. And please mark the 
mails with patches with [PATCH] in the subject.

> Marc Weber

WBR, Sergei

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