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 <[email protected]>
LGTM -- queued for next release...
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John W. Linville Someday the world will need a hero, and you
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