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| author |   Oliver Neukum <oneukum@suse.com> | 2019-07-25 15:13:33 +0200 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2019-08-05 14:18:42 +0200 |
| commit | 01ec0a5f19c8c82960a07f6c7410fc9e01d7fb51 (patch) | |
| tree | 6af44df09f589358eb31188d19bdeaf756c200f2 /drivers/hid/hid-holtek-kbd.c | |
| parent | HID: wacom: fix bit shift for Cintiq Companion 2 (diff) | |
| download | linux-dev-01ec0a5f19c8c82960a07f6c7410fc9e01d7fb51.tar.xz linux-dev-01ec0a5f19c8c82960a07f6c7410fc9e01d7fb51.zip | |
HID: holtek: test for sanity of intfdata
The ioctl handler uses the intfdata of a second interface,
which may not be present in a broken or malicious device, hence
the intfdata needs to be checked for NULL.
[jkosina@suse.cz: fix newly added spurious space]
Reported-by: syzbot+965152643a75a56737be@syzkaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-holtek-kbd.c')
| -rw-r--r-- | drivers/hid/hid-holtek-kbd.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/hid/hid-holtek-kbd.c b/drivers/hid/hid-holtek-kbd.c index b3d502421b79..0a38e8e9bc78 100644 --- a/drivers/hid/hid-holtek-kbd.c +++ b/drivers/hid/hid-holtek-kbd.c @@ -123,9 +123,14 @@ static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type, /* Locate the boot interface, to receive the LED change events */ struct usb_interface *boot_interface = usb_ifnum_to_if(usb_dev, 0); + struct hid_device *boot_hid; + struct hid_input *boot_hid_input; - struct hid_device *boot_hid = usb_get_intfdata(boot_interface); - struct hid_input *boot_hid_input = list_first_entry(&boot_hid->inputs, + if (unlikely(boot_interface == NULL)) + return -ENODEV; + + boot_hid = usb_get_intfdata(boot_interface); + boot_hid_input = list_first_entry(&boot_hid->inputs, struct hid_input, list); return boot_hid_input->input->event(boot_hid_input->input, type, code, |