From: Johan Hovold Date: Wed, 27 Aug 2014 09:55:19 +0000 (+0200) Subject: USB: serial: fix potential heap buffer overflow X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=78107561549eafdcbf85415902b9db0d1d418718;p=karo-tx-linux.git USB: serial: fix potential heap buffer overflow commit 5654699fb38512bdbfc0f892ce54fce75bdc2bab upstream. 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. Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 998eee67f654..9a08e18e09b9 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -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;