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

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commit 0dd408425e 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: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-01-03 16:39:42 +01:00 committed by Greg Kroah-Hartman
parent ad4de3d918
commit 374250ed9b
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/serial/io_edgeport.c
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@ -2761,6 +2761,11 @@ 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 */