diff options
| author | Oliver Neukum <[email protected]> | 2016-03-15 09:14:04 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2016-03-18 16:19:02 +0000 |
| commit | 8835ba4a39cf53f705417b3b3a94eb067673f2c9 (patch) | |
| tree | 87218c976ba7901876cf9ad328823d31ad028fad /drivers/usb/class/cdc-acm.c | |
| parent | USB: usb_driver_claim_interface: add sanity checking (diff) | |
| download | kernel-8835ba4a39cf53f705417b3b3a94eb067673f2c9.tar.gz kernel-8835ba4a39cf53f705417b3b3a94eb067673f2c9.zip | |
USB: cdc-acm: more sanity checking
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 <[email protected]>
CC: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 1d2c99af2532..83fd30b0577c 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1179,6 +1179,9 @@ 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; } |