linux-kernel - [37/74] Bluetooth: bnep: fix buffer overflow

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Message-Id: <20110413155146.938864042@clark.kroah.org>
Date:	Wed, 13 Apr 2011 08:51:01 -0700
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,
	Vasiliy Kulikov <segoon@...nwall.com>,
	"Gustavo F. Padovan" <padovan@...fusion.mobi>
Subject: [37/74] Bluetooth: bnep: fix buffer overflow

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

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

From: Vasiliy Kulikov <segoon@...nwall.com>

commit 43629f8f5ea32a998d06d1bb41eefa0e821ff573 upstream.

Struct ca is copied from userspace.  It is not checked whether the "device"
field is NULL terminated.  This potentially leads to BUG() inside of
alloc_netdev_mqs() and/or information leak by creating a device with a name
made of contents of kernel stack.

Signed-off-by: Vasiliy Kulikov <segoon@...nwall.com>
Signed-off-by: Gustavo F. Padovan <padovan@...fusion.mobi>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/bluetooth/bnep/sock.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/bluetooth/bnep/sock.c
+++ b/net/bluetooth/bnep/sock.c
@@ -88,6 +88,7 @@ static int bnep_sock_ioctl(struct socket
 			sockfd_put(nsock);
 			return -EBADFD;
 		}
+		ca.device[sizeof(ca.device)-1] = 0;

 		err = bnep_add_connection(&ca, nsock);
 		if (!err) {

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