USB: serial: io_edgeport: fix NULL-deref at open

commit 0dd408425eb21ddf26a692b3c8044c9e7d1a7948 upstream.

Fix NULL-pointer dereference when initialising URBs at open should a
non-EPIC device lack a bulk-in or interrupt-in endpoint.

Unable to handle kernel NULL pointer dereference at virtual address 00000028
...
PC is at edge_open+0x24c/0x3e8 [io_edgeport]

Note that the EPIC-device probe path has the required sanity checks so
this makes those checks partially redundant.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Willy Tarreau <w@1wt.eu>

diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index c574d312f1f53e23bbd5db378d7202d4034a4ddc..9f24fd776ec0605f604b6281b93117c144110d9f 100644 (file)
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -2795,6 +2795,11 @@ static int edge_startup(struct usb_serial *serial)
                                        EDGE_COMPATIBILITY_MASK1,
                                        EDGE_COMPATIBILITY_MASK2 };
 
+       if (serial->num_bulk_in < 1 || serial->num_interrupt_in < 1) {
+               dev_err(&serial->interface->dev, "missing endpoints\n");
+               return -ENODEV;
+       }
+
        dev = serial->dev;
 
        /* create our private serial structure */