diff mbox series

HID: magicmouse: fix NULL-deref on disconnect

Message ID 20210517100430.20509-1-johan@kernel.org
State Accepted
Commit 4b4f6cecca446abcb686c6e6c451d4f1ec1a7497
Headers show
Series HID: magicmouse: fix NULL-deref on disconnect | expand

Commit Message

Johan Hovold May 17, 2021, 10:04 a.m. UTC
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(-)

Comments

Jiri Kosina May 26, 2021, 10:51 a.m. UTC | #1
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 mbox series

Patch

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) {