linux-kernel - Re: [PATCH] net/e1000: fix memcpy in e1000_get

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Date:	Wed, 05 Dec 2007 11:23:27 -0800
From:	"Kok, Auke" <auke-jan.h.kok@...el.com>
To:	Roel Kluin <12o3l@...cali.nl>
CC:	lkml <linux-kernel@...r.kernel.org>,
	e1000-devel@...ts.sourceforge.net
Subject: Re: [PATCH] net/e1000: fix memcpy  in e1000_get_strings

Roel Kluin wrote:
> drivers/net/e1000/e1000_ethtool.c:113:
> #define E1000_TEST_LEN sizeof(e1000_gstrings_test) / ETH_GSTRING_LEN
> 
> drivers/net/e1000e/ethtool.c:106:
> #define E1000_TEST_LEN sizeof(e1000_gstrings_test) / ETH_GSTRING_LEN
> 
> E1000_TEST_LEN*ETH_GSTRING_LEN will expand to 
> sizeof(e1000_gstrings_test) / (ETH_GSTRING_LEN * ETH_GSTRING_LEN)
> 
> Please confirm that the change is as wanted.
> --
> A lack of parentheses around defines causes unexpected results due to operator
> precedences.
> 
> Signed-off-by: Roel Kluin <12o3l@...cali.nl>
> ---
> diff --git a/drivers/net/e1000/e1000_ethtool.c b/drivers/net/e1000/e1000_ethtool.c
> index 667f18b..b83ccce 100644
> --- a/drivers/net/e1000/e1000_ethtool.c
> +++ b/drivers/net/e1000/e1000_ethtool.c
> @@ -1923,7 +1923,7 @@ e1000_get_strings(struct net_device *netdev, uint32_t stringset, uint8_t *data)
>  	switch (stringset) {
>  	case ETH_SS_TEST:
>  		memcpy(data, *e1000_gstrings_test,
> -			E1000_TEST_LEN*ETH_GSTRING_LEN);
> +			sizeof(e1000_gstrings_test));
>  		break;
>  	case ETH_SS_STATS:
>  		for (i = 0; i < E1000_GLOBAL_STATS_LEN; i++) {
> diff --git a/drivers/net/e1000e/ethtool.c b/drivers/net/e1000e/ethtool.c
> index 6a39784..338c49d 100644
> --- a/drivers/net/e1000e/ethtool.c
> +++ b/drivers/net/e1000e/ethtool.c
> @@ -1739,7 +1739,7 @@ static void e1000_get_strings(struct net_device *netdev, u32 stringset,
>  	switch (stringset) {
>  	case ETH_SS_TEST:
>  		memcpy(data, *e1000_gstrings_test,
> -			E1000_TEST_LEN*ETH_GSTRING_LEN);
> +				sizeof(e1000_gstrings_test));
>  		break;
>  	case ETH_SS_STATS:
>  		for (i = 0; i < E1000_GLOBAL_STATS_LEN; i++) {


actually this was recently fixed (with a cleanup to use ARRAY_SIZE!), but I really
like the sizeof() safety in the memcpy anyway, so I'll push this patch anyway.

thanks,

Auke
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