linux-kernel - [27/44] DECnet: dont leak uninitialized stack byte

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Date:	Tue, 07 Dec 2010 16:04:26 -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,
	Dan Rosenberg <drosenberg@...curity.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [27/44] DECnet: dont leak uninitialized stack byte

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

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

From: Dan Rosenberg <drosenberg@...curity.com>

commit 3c6f27bf33052ea6ba9d82369fb460726fb779c0 upstream.

A single uninitialized padding byte is leaked to userspace.

Signed-off-by: Dan Rosenberg <drosenberg@...curity.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/decnet/af_decnet.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -1558,6 +1558,8 @@ static int __dn_getsockopt(struct socket
 			if (r_len > sizeof(struct linkinfo_dn))
 				r_len = sizeof(struct linkinfo_dn);
 
+			memset(&link, 0, sizeof(link));
+
 			switch(sock->state) {
 				case SS_CONNECTING:
 					link.idn_linkstate = LL_CONNECTING;


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