| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.16 112/357] USB: serial: fix potential heap buffer overflow | Date | Fri, 3 Oct 2014 14:28:18 -0700 |
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3.16-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
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 <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/serial/usb-serial.c | 5 +++++ 1 file changed, 5 insertions(+)
--- 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_i 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;
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