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HID: magicmouse: fix null pointer dereference in magicmouse_event()

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Add a guard clause to check if 'msc' and 'msc->input' is NULL
before attempting to access its fields, preventing a general
protection fault.

Fixes: b8d56ef91c ("HID: magicmouse: Apple Magic Mouse 2 USB-C support")
Reported-by: syzbot+5ad4fc9c8360b68e353f@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=5ad4fc9c8360b68e353f
Signed-off-by: Nehuen Lian Bova <nehuenlian.kernel@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
This commit is contained in:
Nehuen Lian Bova 2026-10-03 04:29:59 -03:00 committed by Jiri Kosina
parent 9932c9af18
commit 5b66b65cfd
1 changed files with 4 additions and 0 deletions
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4
drivers/hid/hid-magicmouse.c
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@ -553,6 +553,10 @@ static int magicmouse_event(struct hid_device *hdev, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
struct magicmouse_sc *msc = hid_get_drvdata(hdev);
if (!msc || !msc->input)
return 0;
if ((msc->input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2 ||
msc->input->id.product == USB_DEVICE_ID_APPLE_MAGICMOUSE2_USBC) &&
field->report->id == MOUSE2_REPORT_ID) {