diff options
| author | Oliver Neukum <oneukum@suse.com> | 2016-09-20 16:45:42 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-21 10:48:27 +0300 |
| commit | 2ad9d544f2497a7bf239c34bd2b86fd19683dbb5 (patch) | |
| tree | 108951d6036e0c4233b1c0586da568a19a157f8f /drivers/usb/class/cdc-acm.c | |
| parent | 3a383cc0b8cc33af188fe2062b6ba5a69af25fa7 (diff) | |
| download | linux-2ad9d544f2497a7bf239c34bd2b86fd19683dbb5.tar.xz | |
cdc-acm: hardening against malicious devices
This should fix the last holes against malicious devices
still open in cdc-acm. It cannot go into stable due to
the introduction of the common parser.
The fix for stable already merged also covers the problems this patch
fixes.
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class/cdc-acm.c')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 15ffe389b86f..78f0f85bebdc 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, return -EINVAL; } + if (!intf->cur_altsetting) + return -EINVAL; + if (!buflen) { if (intf->cur_altsetting->endpoint && intf->cur_altsetting->endpoint->extralen && @@ -1232,6 +1235,8 @@ static int acm_probe(struct usb_interface *intf, dev_dbg(&intf->dev, "no interfaces\n"); return -ENODEV; } + if (!data_interface->cur_altsetting || !control_interface->cur_altsetting) + return -ENODEV; if (data_intf_num != call_intf_num) dev_dbg(&intf->dev, "Separate call control interface. That is not fully supported.\n"); |