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

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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: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=191811
Fixes: fbae10db09 ("Input: uinput - rework ABS validation")
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2017-01-31 14:56:43 -08:00
parent 05e0be7c90
commit 601bbbe051
1 changed files with 14 additions and 6 deletions
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20
drivers/input/misc/uinput.c
View file

@ -263,13 +263,21 @@ static int uinput_create_device(struct uinput_device *udev)
return -EINVAL; return -EINVAL;
} }
if (test_bit(ABS_MT_SLOT, dev->absbit)) { if (test_bit(EV_ABS, dev->evbit)) {
nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1; input_alloc_absinfo(dev);
error = input_mt_init_slots(dev, nslot, 0); if (!dev->absinfo) {
if (error) error = -EINVAL;
goto fail1; goto fail1;
} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) { }
input_set_events_per_packet(dev, 60);
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);
if (error)
goto fail1;
} 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) { if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {