On Wed, May 09, 2018 at 02:01:46PM +0200, Michal Kubecek wrote: > Users reported stack clash detected when using --get-phy-tunable on > ppc64le. Problem is caused by local variable ds of type struct > ethtool_tunable which has last member "void *data[0]". Accessing data[0] > (as do_get_phy_tunable() does) or adding requested value at the end (which > is what kernel ioctl does) writes past allocated space for the variable. > > Make ds part of an anonymous structure to make sure there is enough space > for tunable value and drop the (pointless) access to ds.data[0]. The same > problem also exists in do_set_phy_tunable(). > > Fixes: b0fe96dec90f ("Ethtool: Implements > ETHTOOL_PHY_GTUNABLE/ETHTOOL_PHY_STUNABLE and PHY downshift") > Signed-off-by: Michal Kubecek <mkube...@suse.cz>
LGTM -- queued for next release... -- John W. Linville Someday the world will need a hero, and you linvi...@tuxdriver.com might be all we have. Be ready.