| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 32/93] Bluetooth: Fix incorrect strncpy() in hidp_setup_hid() | Date | Tue, 5 Feb 2013 20:06:21 -0200 |
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3.5.7.5 -stable review patch. If anyone has any objections, please let me know.
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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(-)
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); -- 1.7.9.5
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