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Subject[PATCH] HID: magicmouse: prevent division by 0 on scroll
Date
In hid_magicmouse, if the user has set scroll_speed to a value between
55 and 63 and scrolls seven times in quick succession, the
step_hr variable in the magicmouse_emit_touch function becomes 0.

That causes a division by zero further down in the function when
it does `step_x_hr /= step_hr`.

To reproduce, create `/etc/modprobe.d/hid_magicmouse.conf` with the
following content:

```
options hid_magicmouse scroll_acceleration=1 scroll_speed=55
```

Then reboot, connect a Magic Mouse and scroll seven times quickly.
The system will freeze for a minute, and after that `dmesg` will
confirm that a division by zero occurred.

Enforce a minimum of 1 for the variable so the high resolution
step count can never reach 0 even at maximum scroll acceleration.

Fixes: d4b9f10a0eb6 ("HID: magicmouse: enable high-resolution scroll")

Signed-off-by: Claudia Pellegrino <linux@cpellegrino.de>
---
drivers/hid/hid-magicmouse.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-magicmouse.c b/drivers/hid/hid-magicmouse.c
index 686788ebf3e1..d7687ce70614 100644
--- a/drivers/hid/hid-magicmouse.c
+++ b/drivers/hid/hid-magicmouse.c
@@ -256,8 +256,11 @@ static void magicmouse_emit_touch(struct magicmouse_sc *msc, int raw_id, u8 *tda
unsigned long now = jiffies;
int step_x = msc->touches[id].scroll_x - x;
int step_y = msc->touches[id].scroll_y - y;
- int step_hr = ((64 - (int)scroll_speed) * msc->scroll_accel) /
- SCROLL_HR_STEPS;
+ int step_hr =
+ max_t(int,
+ ((64 - (int)scroll_speed) * msc->scroll_accel) /
+ SCROLL_HR_STEPS,
+ 1);
int step_x_hr = msc->touches[id].scroll_x_hr - x;
int step_y_hr = msc->touches[id].scroll_y_hr - y;

--
2.33.1
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