tree 68223613ef046f1e3182ac267fc053c0c2331f46
parent 4236e40a9d4facd4b3e6c67ccc1e486d6254cf50
author Johan Hovold <johan@kernel.org> 1534845592 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1537943796 +0200

USB: serial: io_ti: fix array underflow in completion handler

commit 691a03cfe8ca483f9c48153b869d354e4ae3abef upstream.

As reported by Dan Carpenter, a malicious USB device could set
port_number to a negative value and we would underflow the port array in
the interrupt completion handler.

As these devices only have one or two ports, fix this by making sure we
only consider the seventh bit when determining the port number (and
ignore bits 0xb0 which are typically set to 0x30).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>