linux-kernel - Re: [PATCH 2.6.22-rc4] ehea: Fixed possible kernel panic on VLAN packet recv

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Message-Id: <1181176500.4166.1.camel@concordia.ozlabs.ibm.com>
Date:	Thu, 07 Jun 2007 10:35:00 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Thomas Klein <osstklei@...ibm.com>
Cc:	Jeff Garzik <jeff@...zik.org>, Thomas Klein <tklein@...ibm.com>,
	Jan-Bernd Themann <themann@...ibm.com>,
	netdev <netdev@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Christoph Raisch <raisch@...ibm.com>,
	Stefan Roscher <ossrosch@...ux.vnet.ibm.com>,
	linux-ppc <linuxppc-dev@...abs.org>,
	Marcus Eder <meder@...ibm.com>
Subject: Re: [PATCH 2.6.22-rc4] ehea: Fixed possible kernel panic on VLAN
	packet recv

On Wed, 2007-06-06 at 20:53 +0200, Thomas Klein wrote:
> This patch fixes a possible kernel panic due to not checking the vlan group
> when processing received VLAN packets and a malfunction in VLAN/hypervisor
> registration.
> 
> 
> Signed-off-by: Thomas Klein <tklein@...ibm.com>
> ---
> 
> 
> diff -Nurp -X dontdiff linux-2.6.22-rc4/drivers/net/ehea/ehea.h patched_kernel/drivers/net/ehea/ehea.h
> --- linux-2.6.22-rc4/drivers/net/ehea/ehea.h	2007-06-05 02:57:25.000000000 +0200
> +++ patched_kernel/drivers/net/ehea/ehea.h	2007-06-06 12:53:58.000000000 +0200
> @@ -39,7 +39,7 @@
>  #include <asm/io.h>
>  
>  #define DRV_NAME	"ehea"
> -#define DRV_VERSION	"EHEA_0061"
> +#define DRV_VERSION	"EHEA_0064"
>  
>  #define EHEA_MSG_DEFAULT (NETIF_MSG_LINK | NETIF_MSG_TIMER \
>  	| NETIF_MSG_RX_ERR | NETIF_MSG_TX_ERR)
> diff -Nurp -X dontdiff linux-2.6.22-rc4/drivers/net/ehea/ehea_main.c patched_kernel/drivers/net/ehea/ehea_main.c
> --- linux-2.6.22-rc4/drivers/net/ehea/ehea_main.c	2007-06-05 02:57:25.000000000 +0200
> +++ patched_kernel/drivers/net/ehea/ehea_main.c	2007-06-06 12:53:58.000000000 +0200
> @@ -1947,7 +1945,7 @@ static void ehea_vlan_rx_add_vid(struct 
>  	}
>  
>  	index = (vid / 64);
> -	cb1->vlan_filter[index] |= ((u64)(1 << (vid & 0x3F)));
> +	cb1->vlan_filter[index] |= ((u64)(0x8000000000000000 >> (vid & 0x3F)));
>  
>  	hret = ehea_h_modify_ehea_port(adapter->handle, port->logical_port_id,
>  				       H_PORT_CB1, H_PORT_CB1_ALL, cb1);
> @@ -1982,7 +1980,7 @@ static void ehea_vlan_rx_kill_vid(struct
>  	}
>  
>  	index = (vid / 64);
> -	cb1->vlan_filter[index] &= ~((u64)(1 << (vid & 0x3F)));
> +	cb1->vlan_filter[index] &= ~((u64)(0x8000000000000000 >> (vid & 0x3F)));

These two seem ripe for splitting into some sort of helper routine.
Which would leave only one place to get it right.

cheers

-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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