Patchwork [32/93] Bluetooth: Fix incorrect strncpy() in hidp_setup_hid()

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Submitter Herton Ronaldo Krzesinski
Date Feb. 5, 2013, 10:06 p.m.
Message ID <1360102042-10732-33-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/218396/
State New
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Comments

Herton Ronaldo Krzesinski - Feb. 5, 2013, 10:06 p.m.
3.5.7.5 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 0a9ab9bdb3e891762553f667066190c1d22ad62b upstream.

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.)

Signed-off-by: Anderson Lizardo <anderson.lizardo@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
[ herton: adjust context ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 net/bluetooth/hidp/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/net/bluetooth/hidp/core.c b/net/bluetooth/hidp/core.c
index 2c20d76..217359b 100644
--- a/net/bluetooth/hidp/core.c
+++ b/net/bluetooth/hidp/core.c
@@ -949,7 +949,7 @@  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(&bt_sk(session->ctrl_sock->sk)->src), 64);
 	strncpy(hid->uniq, batostr(&bt_sk(session->ctrl_sock->sk)->dst), 64);