| Message ID | 20210517100430.20509-1-johan@kernel.org |
|---|---|
| State | Accepted |
| Commit | 4b4f6cecca446abcb686c6e6c451d4f1ec1a7497 |
| Headers | show |
| Series | HID: magicmouse: fix NULL-deref on disconnect | expand |
On Mon, 17 May 2021, Johan Hovold wrote: > Commit 9d7b18668956 ("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: 9d7b18668956 ("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> Applied, thanks Johan. -- Jiri Kosina SUSE Labs
diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c index 2bb473d8c424..56dda50aa3d8 100644 --- a/drivers/hid/hid-magicmouse.c +++ b/drivers/hid/hid-magicmouse.c @@ -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) {
Commit 9d7b18668956 ("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: 9d7b18668956 ("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> --- drivers/hid/hid-magicmouse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)