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Input: uinput - sanity check on ff_effects_max and EV_FF 

Currently the user can set ff_effects_max to zero with the EV_FF bit (and
the FF_GAIN and/or FF_AUTOCENTER bits) set, in this case the uninitialized
methods ff->set_gain and/or ff->set_autocenter can be dereferenced,
resulting in a kernel oops.

Check in uinput_create_device() and print a helpful message and return
-EINVAL in case the check fails.

Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Elias Vanderstuyft 2015-12-18 17:32:19 -08:00 committed by Dmitry Torokhov
parent fbae10db09
commit daf6cd0c18
1 changed files with 7 additions and 0 deletions
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7
drivers/input/misc/uinput.c
View File

@ -272,6 +272,13 @@ static int uinput_create_device(struct uinput_device *udev)
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",
UINPUT_NAME);
error = -EINVAL;
goto fail1;
}
if (udev->ff_effects_max) {
error = input_ff_create(dev, udev->ff_effects_max);
if (error)