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Subject[PATCH 3.12 020/142] USB: iowarrior: fix NULL-deref in write
Date
From: Johan Hovold <johan@kernel.org>

3.12-stable review patch. If anyone has any objections, please let me know.

===============

commit de46e56653de7b3b54baa625bd582635008b8d05 upstream.

Make sure to verify that we have the required interrupt-out endpoint for
IOWarrior56 devices to avoid dereferencing a NULL-pointer in write
should a malicious device lack such an endpoint.

Fixes: 946b960d13c1 ("USB: add driver for iowarrior devices.")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/usb/misc/iowarrior.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 6dda72ef6ccf..05aa716cf6b5 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -809,6 +809,14 @@ static int iowarrior_probe(struct usb_interface *interface,
goto error;
}

+ if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
+ if (!dev->int_out_endpoint) {
+ dev_err(&interface->dev, "no interrupt-out endpoint found\n");
+ retval = -ENODEV;
+ goto error;
+ }
+ }
+
/* we have to check the report_size often, so remember it in the endianness suitable for our machine */
dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
--
2.12.2
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