linux-kernel - [PATCH] bluetooth: hidp: fix information leak to userland

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Message-Id: <1288448791-6009-1-git-send-email-segooon@gmail.com>
Date:	Sat, 30 Oct 2010 18:26:31 +0400
From:	Vasiliy Kulikov <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Kosina <jkosina@...e.cz>,
	Michael Poole <mdpoole@...ilus.org>,
	Bastien Nocera <hadess@...ess.net>,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] bluetooth: hidp: fix information leak to userland

Structure hidp_conninfo is copied to userland with version, product,
vendor and name fields unitialized if both session->input and session->hid
are NULL.  It leads to leaking of contents of kernel stack memory.

Signed-off-by: Vasiliy Kulikov <segooon@...il.com>
---
 Compile tested.

 net/bluetooth/hidp/core.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index c0ee8b3..29544c2 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -107,6 +107,7 @@ static void __hidp_unlink_session(struct hidp_session *session)
 
 static void __hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
 {
+	memset(ci, 0, sizeof(*ci));
 	bacpy(&ci->bdaddr, &session->bdaddr);
 
 	ci->flags = session->flags;
@@ -115,7 +116,6 @@ static void __hidp_copy_session(struct hidp_session *session, struct hidp_connin
 	ci->vendor  = 0x0000;
 	ci->product = 0x0000;
 	ci->version = 0x0000;
-	memset(ci->name, 0, 128);
 
 	if (session->input) {
 		ci->vendor  = session->input->id.vendor;
-- 
1.7.0.4

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