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USB: iowarrior: fix oops with malicious USB descriptors

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The iowarrior driver expects at least one valid endpoint.  If given
malicious descriptors that specify 0 for the number of endpoints,
it will crash in the probe function.  Ensure there is at least
one endpoint on the interface before using it.

The full report of this issue can be found here:
http://seclists.org/bugtraq/2016/Mar/87

Change-Id: I78dfd62f4d0a77d8145dfba5c479e6ac766374cc
Reported-by: Ralf Spenneberg <ralf@spenneberg.net>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Boyer 2016-03-14 10:42:38 -04:00 committed by Flex1911
parent 39034b257a
commit 4c83bc5083
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/misc/iowarrior.c
View file

@ -792,6 +792,12 @@ static int iowarrior_probe(struct usb_interface *interface,
iface_desc = interface->cur_altsetting;
dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
if (iface_desc->desc.bNumEndpoints < 1) {
dev_err(&interface->dev, "Invalid number of endpoints\n");
retval = -EINVAL;
goto error;
}
/* set up the endpoint information */
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;