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USB: serial: fix potential heap buffer overflow

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Make sure to verify the number of ports requested by subdriver to avoid
writing beyond the end of fixed-size array in interface data.

The current usb-serial implementation is limited to eight ports per
interface but failed to verify that the number of ports requested by a
subdriver (which could have been determined from device descriptors) did
not exceed this limit.

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2014-08-27 11:55:19 +02:00 committed by Greg Kroah-Hartman
parent d979e9f9ec
commit 5654699fb3
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/serial/usb-serial.c
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@ -862,6 +862,11 @@ static int usb_serial_probe(struct usb_interface *interface,
num_ports = type->num_ports;
}
if (num_ports > MAX_NUM_PORTS) {
dev_warn(ddev, "too many ports requested: %d\n", num_ports);
num_ports = MAX_NUM_PORTS;
}
serial->num_ports = num_ports;
serial->num_bulk_in = num_bulk_in;
serial->num_bulk_out = num_bulk_out;