On Wed, Mar 20, 2019 at 10:09:44AM +0200, Alexander Shishkin wrote:
> commit bf7cbaae0831252b416f375ca9b1027ecd4642dd upstream.
>
> Using STP_POLICY_ID_SET ioctl command with dummy_stm device, or any STM
> device that supplies zero mmio channel size, will trigger a division by
> zero bug in the kernel.
>
> Prevent this by disallowing channel widths other than 1 for such devices.
>
> Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
> Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
> ---
> drivers/hwtracing/stm/core.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
Thanks for all of the backports, now queued up.
greg k-h
