netdev - [PATCH] [ETHTOOL]: EEPROM dump no longer works for tg3 and natsemi

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Message-ID: <20080425022030.GA593@google.com>
Date:	Thu, 24 Apr 2008 19:20:30 -0700
From:	Mandeep Singh Baines <msb@...gle.com>
To:	netdev@...r.kernel.org, leitao@...ux.vnet.ibm.com,
	davem@...emloft.net
Cc:	thockin@...gle.com, jeff@...zik.org, joe@...ches.com,
	nil@...gle.com, matthew@....cx
Subject: [PATCH] [ETHTOOL]: EEPROM dump no longer works for tg3 and natsemi

In the ethtool user-space application, tg3 and natsemi over-ride the default
implementation of dump_eeprom(). In both tg3_dump_eeprom() and
natsemi_dump_eeprom(), there is a magic number check which is not present in
the default implementation.

Commit b131dd5d snipped the code which copied the ethtool_eeprom structure
back to user-space. tg3 and natsemi are over-writing the magic number field
and then checking it in user-space. With the ethtool_eeprom copy removed, the
check is failing.

The fix is simple. Add the ethtool_eeprom copy back.

Signed-off-by: Mandeep Singh Baines <msb@...gle.com>
---
 net/core/ethtool.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index a29b43d..0133b5e 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -323,6 +323,11 @@ static int ethtool_get_eeprom(struct net_device *dev, void __user *useraddr)
 		bytes_remaining -= eeprom.len;
 	}

+	eeprom.len = userbuf - (useraddr + sizeof(eeprom));
+	eeprom.offset -= eeprom.len;
+	if (copy_to_user(useraddr, &eeprom, sizeof(eeprom)))
+		ret = -EFAULT;
+
 	kfree(data);
 	return ret;
 }
-- 
1.5.2.5

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