| commit | bf7cbaae0831252b416f375ca9b1027ecd4642dd | [log] [tgz] |
|---|---|---|
| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | Thu Feb 21 14:19:17 2019 +0200 |
| committer | Alexander Shishkin <alexander.shishkin@linux.intel.com> | Thu Feb 21 17:44:18 2019 +0200 |
| tree | 4cb6da8afa3f5081b5e3ab7c2c8e2197c9aa7325 | |
| parent | a1d75dad3a2c689e70a1c4e0214cca9de741d0aa [diff] |
stm class: Prevent division by zero
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@linux.intel.com>
Fixes: 7bd1d4093c2f ("stm class: Introduce an abstraction for System Trace Module devices")
CC: stable@vger.kernel.org # v4.4+