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Message-Id: <20190814021047.14828-87-sashal@kernel.org>
Date: Tue, 13 Aug 2019 22:10:11 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Oliver Neukum <oneukum@...e.com>,
syzbot+965152643a75a56737be@...kaller.appspotmail.com,
Jiri Kosina <jkosina@...e.cz>, Sasha Levin <sashal@...nel.org>,
linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 5.2 087/123] HID: holtek: test for sanity of intfdata
From: Oliver Neukum <oneukum@...e.com>
[ Upstream commit 01ec0a5f19c8c82960a07f6c7410fc9e01d7fb51 ]
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@...e.cz: fix newly added spurious space]
Reported-by: syzbot+965152643a75a56737be@...kaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/hid/hid-holtek-kbd.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/hid/hid-holtek-kbd.c b/drivers/hid/hid-holtek-kbd.c
index b3d502421b79d..0a38e8e9bc783 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,
--
2.20.1
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