linux-kernel - [ 097/184] Bluetooth: Fix incorrect strncpy() in

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Message-Id: <20130604172134.330397379@1wt.eu>
Date:	Tue, 04 Jun 2013 19:23:07 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Anderson Lizardo <anderson.lizardo@...nbossa.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Willy Tarreau <w@....eu>
Subject: [ 097/184] Bluetooth: Fix incorrect strncpy() in

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

------------------
 hidp_setup_hid()

From: Anderson Lizardo <anderson.lizardo@...nbossa.org>

The length parameter should be sizeof(req->name) - 1 because there is no
guarantee that string provided by userspace will contain the trailing
'\0'.

Can be easily reproduced by manually setting req->name to 128 non-zero
bytes prior to ioctl(HIDPCONNADD) and checking the device name setup on
input subsystem:

$ cat /sys/devices/pnp0/00\:04/tty/ttyS0/hci0/hci0\:1/input8/name
AAAAAA[...]AAAAAAAAf0:af:f0:af:f0:af

("f0:af:f0:af:f0:af" is the device bluetooth address, taken from "phys"
field in struct hid_device due to overflow.)

Cc: stable@...r.kernel.org
Signed-off-by: Anderson Lizardo <anderson.lizardo@...nbossa.org>
Acked-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

[backported to 2.6.32 jmm]
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/bluetooth/hidp/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 49d8495..0c2c59d 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -778,7 +778,7 @@ static int hidp_setup_hid(struct hidp_session *session,
 	hid->version = req->version;
 	hid->country = req->country;
 
-	strncpy(hid->name, req->name, 128);
+	strncpy(hid->name, req->name, sizeof(req->name) - 1);
 	strncpy(hid->phys, batostr(&src), 64);
 	strncpy(hid->uniq, batostr(&dst), 64);
 
-- 
1.7.12.2.21.g234cd45.dirty



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