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USB: cdc-acm: more sanity checking

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commit 8835ba4a39cf53f705417b3b3a94eb067673f2c9 upstream.

An attack has become available which pretends to be a quirky
device circumventing normal sanity checks and crashes the kernel
by an insufficient number of interfaces. This patch adds a check
to the code path for quirky devices.

Signed-off-by: Oliver Neukum <ONeukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
This commit is contained in:
Oliver Neukum 2016-03-15 10:14:04 +01:00 committed by Ben Hutchings
parent 79a575e829
commit c50eccdcbb
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/class/cdc-acm.c
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@ -926,6 +926,9 @@ static int acm_probe(struct usb_interface *intf,
if (quirks == NO_UNION_NORMAL) {
data_interface = usb_ifnum_to_if(usb_dev, 1);
control_interface = usb_ifnum_to_if(usb_dev, 0);
/* we would crash */
if (!data_interface || !control_interface)
return -ENODEV;
goto skip_normal_probe;
}