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HID: magicmouse: fix NULL-deref on disconnect 

Commit 9d7b186689 ("HID: magicmouse: add support for Apple Magic
Trackpad 2") added a sanity check for an Apple trackpad but returned
success instead of -ENODEV when the check failed. This means that the
remove callback will dereference the never-initialised driver data
pointer when the driver is later unbound (e.g. on USB disconnect).

Reported-by: syzbot+ee6f6e2e68886ca256a8@syzkaller.appspotmail.com
Fixes: 9d7b186689 ("HID: magicmouse: add support for Apple Magic Trackpad 2")
Cc: stable@vger.kernel.org      # 4.20
Cc: Claudio Mettler <claudio@ponyfleisch.ch>
Cc: Marek Wyborski <marek.wyborski@emwesoft.com>
Cc: Sean O'Brien <seobrien@chromium.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Johan Hovold 2021-05-17 12:04:30 +02:00 committed by Jiri Kosina
parent 22db5e0003
commit 4b4f6cecca
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hid-magicmouse.c
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@ -693,7 +693,7 @@ static int magicmouse_probe(struct hid_device *hdev,
if (id->vendor == USB_VENDOR_ID_APPLE &&
id->product == USB_DEVICE_ID_APPLE_MAGICTRACKPAD2 &&
hdev->type != HID_TYPE_USBMOUSE)
return 0;
return -ENODEV;
msc = devm_kzalloc(&hdev->dev, sizeof(*msc), GFP_KERNEL);
if (msc == NULL) {