linux-kernel - [29/44] net: clear heap allocations for privileged ethtool actions

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Message-Id: <20101208000642.468707494@clark.site>
Date:	Tue, 07 Dec 2010 16:04:28 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kees Cook <kees.cook@...onical.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [29/44] net: clear heap allocations for privileged ethtool actions

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------


From: Kees Cook <kees.cook@...onical.com>

[ Upstream commit b00916b189d13a615ff05c9242201135992fcda3 ]

Several other ethtool functions leave heap uncleared (potentially) by
drivers. Some interfaces appear safe (eeprom, etc), in that the sizes
are well controlled. In some situations (e.g. unchecked error conditions),
the heap will remain unchanged in areas before copying back to userspace.
Note that these are less of an issue since these all require CAP_NET_ADMIN.

Cc: stable@...nel.org
Signed-off-by: Kees Cook <kees.cook@...onical.com>
Acked-by: Ben Hutchings <bhutchings@...arflare.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/core/ethtool.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -256,7 +256,7 @@ static int ethtool_get_regs(struct net_d
 	if (regs.len > reglen)
 		regs.len = reglen;
 
-	regbuf = kmalloc(reglen, GFP_USER);
+	regbuf = kzalloc(reglen, GFP_USER);
 	if (!regbuf)
 		return -ENOMEM;
 


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