netdev - RE: [Intel-wired-lan] [PATCH iwl-net v5] ice: Fix memory management in ice_ethtool

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Message-ID: <BL0PR11MB31227085056719609ED303E0BD3BA@BL0PR11MB3122.namprd11.prod.outlook.com>
Date: Mon, 17 Jul 2023 05:12:53 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: "Jagielski, Jedrzej" <jedrzej.jagielski@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>, "Jagielski, Jedrzej"
	<jedrzej.jagielski@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH iwl-net v5] ice: Fix memory management
 in ice_ethtool_fdir.c

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Jedrzej Jagielski
> Sent: Wednesday, July 12, 2023 6:32 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: netdev@...r.kernel.org; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>; Jagielski, Jedrzej <jedrzej.jagielski@...el.com>
> Subject: [Intel-wired-lan] [PATCH iwl-net v5] ice: Fix memory management in ice_ethtool_fdir.c
>
> Fix ethtool FDIR logic to not use memory 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 first fail to be added via ice_fdir_update_list_entry() but then may be 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.
>
> Reported-by: Michal Schmidt <mschmidt@...hat.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@...el.com>
> Signed-off-by: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
> ---
> v2: extend CC list, fix freeing memory before return
> v3: correct typos in the commit msg
> v4: restore devm() approach
> v5: minor changes
> ---
>  .../net/ethernet/intel/ice/ice_ethtool_fdir.c | 26 ++++++++++---------
>  1 file changed, 14 insertions(+), 12 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)