Commit 2089e456 authored by Dmitry Torokhov's avatar Dmitry Torokhov Committed by Greg Kroah-Hartman

Input: uinput - fix crash when mixing old and new init style

commit 601bbbe0 upstream.

If user tries to initialize uinput device mixing old and new style
initialization (i.e. using old UI_SET_ABSBIT instead of UI_ABS_SETUP,
we forget to allocate input->absinfo and will crash when trying to send
absolute events:

        ioctl(ui, UI_DEV_SETUP, &us);
        ioctl(ui, UI_SET_PHYS, "Test");

        ioctl(ui, UI_SET_EVBIT, EV_ABS);
        ioctl(ui, UI_SET_ABSBIT, ABS_X);
        ioctl(ui, UI_SET_ABSBIT, ABS_Y);
        ioctl(ui, UI_DEV_CREATE, 0);
Reported-by: default avatarRodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=191811
Fixes: fbae10db ("Input: uinput - rework ABS validation")
Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1a815c52
......@@ -263,6 +263,13 @@ static int uinput_create_device(struct uinput_device *udev)
return -EINVAL;
}
if (test_bit(EV_ABS, dev->evbit)) {
input_alloc_absinfo(dev);
if (!dev->absinfo) {
error = -EINVAL;
goto fail1;
}
if (test_bit(ABS_MT_SLOT, dev->absbit)) {
nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
error = input_mt_init_slots(dev, nslot, 0);
......@@ -271,6 +278,7 @@ static int uinput_create_device(struct uinput_device *udev)
} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
input_set_events_per_packet(dev, 60);
}
}
if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
......
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