linux-kernel - Re: [PATCH] netxen: memory corruption by netxen_p3_get_mac

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Date:	Sat, 3 Mar 2012 21:35:38 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	santosh nayak <santoshprasadnayak@...il.com>
Cc:	sony.chacko@...gic.com, rajesh.borundia@...gic.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dhananjay Phadke <dhananjay@...xen.com>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] netxen: memory corruption by netxen_p3_get_mac_addr.

On Sat, Mar 03, 2012 at 10:31:27PM +0530, santosh nayak wrote:
> From: Santosh Nayak <santoshprasadnayak@...il.com>
> 
> 'mac_hi' and 'mac_lo' are 32 bit unsinged int but we are modifing
> 64 bit of memory during mac calculation. To fix this issue define
> a local variable of 64 bit and do mac calculation.
> 

I'm not seeing any memory corruption.  How do you figure?

> Remove 'le64_to_cpu' to fix endian issue.

I've add Dhananjay to the CC list to comment on the endian change.

regards,
dan carpenter

> 
> Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
> ---
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c |    7 ++++---
>  1 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
> index 0f81287..7ea930b 100644
> --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
> +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_hw.c
> @@ -1069,7 +1069,8 @@ int netxen_get_flash_mac_addr(struct netxen_adapter *adapter, u64 *mac)
>  
>  int netxen_p3_get_mac_addr(struct netxen_adapter *adapter, u64 *mac)
>  {
> -	uint32_t crbaddr, mac_hi, mac_lo;
> +	uint32_t crbaddr;
> +	u64 mac_hi, mac_lo;
>  	int pci_func = adapter->ahw.pci_func;
>  
>  	crbaddr = CRB_MAC_BLOCK_START +
> @@ -1079,9 +1080,9 @@ int netxen_p3_get_mac_addr(struct netxen_adapter *adapter, u64 *mac)
>  	mac_hi = NXRD32(adapter, crbaddr+4);
>  
>  	if (pci_func & 1)
> -		*mac = le64_to_cpu((mac_lo >> 16) | ((u64)mac_hi << 16));
> +		*mac = (mac_lo >> 16) | (mac_hi << 16);
>  	else
> -		*mac = le64_to_cpu((u64)mac_lo | ((u64)mac_hi << 32));
> +		*mac = mac_lo | (mac_hi << 32);
>  
>  	return 0;
>  }
> -- 
> 1.7.4.4
> 
> --
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