linux-kernel - [PATCH] [26/106] Bluetooth: bnep: fix buffer overflow

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Message-Id: <20110426211305.2003B3E1886@tassilo.jf.intel.com>
Date:	Tue, 26 Apr 2011 14:13:05 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	segoon@...nwall.com, padovan@...fusion.mobi, gregkh@...e.de,
	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org, tim.bird@...sony.com
Subject: [PATCH] [26/106] Bluetooth: bnep: fix buffer overflow

2.6.35-longterm review patch.  If anyone has any objections, please let me 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>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

Index: linux-2.6.35.y/net/bluetooth/bnep/sock.c
===================================================================
--- linux-2.6.35.y.orig/net/bluetooth/bnep/sock.c
+++ linux-2.6.35.y/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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