From: Kangjie Lu <kangjielu@gmail.com>
Date: Sun, 8 May 2016 16:10:14 +0000 (-0400)
Subject: net: fix a kernel infoleak in x25 module
X-Git-Tag: firefly_0821_release~176^2~4^2~45^2~39
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=83857201758ead21e19e36d9ab5b2f87be03dfe2;p=firefly-linux-kernel-4.4.55.git

net: fix a kernel infoleak in x25 module

[ Upstream commit 79e48650320e6fba48369fccf13fd045315b19b8 ]

Stack object "dte_facilities" is allocated in x25_rx_call_request(),
which is supposed to be initialized in x25_negotiate_facilities.
However, 5 fields (8 bytes in total) are not initialized. This
object is then copied to userland via copy_to_user, thus infoleak
occurs.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/x25/x25_facilities.c b/net/x25/x25_facilities.c
index 7ecd04c21360..997ff7b2509b 100644
--- a/net/x25/x25_facilities.c
+++ b/net/x25/x25_facilities.c
@@ -277,6 +277,7 @@ int x25_negotiate_facilities(struct sk_buff *skb, struct sock *sk,
 
 	memset(&theirs, 0, sizeof(theirs));
 	memcpy(new, ours, sizeof(*new));
+	memset(dte, 0, sizeof(*dte));
 
 	len = x25_parse_facilities(skb, &theirs, dte, &x25->vc_facil_mask);
 	if (len < 0)