From: Dan Rosenberg <drosenberg@vsecurity.com>
Date: Tue, 23 Nov 2010 11:02:13 +0000 (+0000)
Subject: DECnet: don't leak uninitialized stack byte
X-Git-Tag: firefly_0821_release~10186^2~662
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=38e6b47228e9a04b90f79b91a9569d2d21288444;p=firefly-linux-kernel-4.4.55.git

DECnet: don't leak uninitialized stack byte

commit 3c6f27bf33052ea6ba9d82369fb460726fb779c0 upstream.

A single uninitialized padding byte is leaked to userspace.

Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index 7a58c87baf17..5df7b5453556 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -1555,6 +1555,8 @@ static int __dn_getsockopt(struct socket *sock, int level,int optname, char __us
 			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;