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authorJohan Hovold <johan@kernel.org>2014-06-05 16:05:52 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-07-09 11:21:24 -0700
commit621359d81e8488a0810e1b562625169f47b0d2c6 (patch)
treeaba6a4f45bad7b00b5dc9ee56b71dc42a423b57b
parent02aa24f7a8100e3aa8512030498fc7240f67d210 (diff)
USB: ftdi_sio: fix null deref at port probe
commit aea1ae8760314e072bf1b773521e9de5d5dda10d upstream. Fix NULL-pointer dereference when probing an interface with no endpoints. These devices have two bulk endpoints per interface, but this avoids crashing the kernel if a user forces a non-FTDI device to be probed. Note that the iterator variable was made unsigned in order to avoid a maybe-uninitialized compiler warning for ep_desc after the loop. Fixes: 895f28badce9 ("USB: ftdi_sio: fix hi-speed device packet size calculation") Reported-by: Mike Remski <mremski@mutualink.net> Tested-by: Mike Remski <mremski@mutualink.net> Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/serial/ftdi_sio.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index edf3b124583..115662c16dc 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1566,14 +1566,17 @@ static void ftdi_set_max_packet_size(struct usb_serial_port *port)
struct usb_device *udev = serial->dev;
struct usb_interface *interface = serial->interface;
- struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
+ struct usb_endpoint_descriptor *ep_desc;
unsigned num_endpoints;
- int i;
+ unsigned i;
num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
+ if (!num_endpoints)
+ return;
+
/* NOTE: some customers have programmed FT232R/FT245R devices
* with an endpoint size of 0 - not good. In this case, we
* want to override the endpoint descriptor setting and use a