This is a note to let you know that I've just added the patch titled
Input: uinput - fix crash when mixing old and new init style
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-uinput-fix-crash-when-mixing-old-and-new-init-style.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 601bbbe0517303c9f8eb3d75e11d64efed1293c9 Mon Sep 17 00:00:00 2001
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Date: Tue, 31 Jan 2017 14:56:43 -0800
Subject: Input: uinput - fix crash when mixing old and new init style
From: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
commit 601bbbe0517303c9f8eb3d75e11d64efed1293c9 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: Rodrigo Rivas Costa <rodrigorivascosta@xxxxxxxxx>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=191811
Fixes: fbae10db0940 ("Input: uinput - rework ABS validation")
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/misc/uinput.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -263,13 +263,21 @@ static int uinput_create_device(struct u
return -EINVAL;
}
- 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)
+ if (test_bit(EV_ABS, dev->evbit)) {
+ input_alloc_absinfo(dev);
+ if (!dev->absinfo) {
+ error = -EINVAL;
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) {
Patches currently in stable-queue which might be from dmitry.torokhov@xxxxxxxxx are
queue-4.9/input-uinput-fix-crash-when-mixing-old-and-new-init-style.patch
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