Re: [PATCH iwl-net v2] ice: Fix memory management in ice_ethtool_fdir.c

[Simon Horman <simon.horman@corigine.com>]

On Mon, Jul 03, 2023 at 01:30:00PM +0200, Jedrzej Jagielski wrote:
> Fix ethtool FDIR logic to not use momory after its release.
> In the ice_ethtool_fdir.c file there are 2 spots where code can
> refer to pointers which may be missing.
> 
> In the ice_cfg_fdir_xtrct_seq() function seg may be freed but
> even then may be still used by memcpy(&tun_seg[1], seg, sizeof(*seg)).
> 
> In the ice_add_fdir_ethtool() function struct ice_fdir_fltr *input
> may firstly fail to be added via ice_fdir_update_list_entry() but then
> may be tried to being deleted by ice_fdir_update_list_entry.
> 
> Terminate in both cases when the returned value of the previous
> operation is other than 0, free memory and don't use it anymore.
> 
> Replace managed memory alloc with kzalloc/kfree in
> ice_cfg_fdir_xtrct_seq() since seg/tun_seg are used only by
> ice_fdir_set_hw_fltr_rule().
> 
> Reported-by: Michal Schmidt <mschmidt@redhat.com>
> Link: https://bugzilla.redhat.com/show_bug.cgi?id=2208423
> Fixes: cac2a27cd9ab ("ice: Support IPv4 Flow Director filters")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
> Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@intel.com>

Reviewed-by: Simon Horman <simon.horman@corigine.com>