Bluetooth: hidp: fix buffer overflow

Bluetooth: hidp: fix buffer overflow

CVE-2019-11884

Struct ca is copied from userspace. It is not checked whether the "name"
field is NULL terminated, which allows local users to obtain potentially
sensitive information from kernel stack memory, via a HIDPCONNADD command.

This vulnerability is similar to CVE-2011-1079.

Signed-off-by: Young Xiao <YangX92@hotmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
(cherry picked from commit a1616a5ac99ede5d605047a9012481ce7ff18b16)
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>