netdev - Re: [PATCH iwl-net v5] ice: Fix memory management in ice_ethtool

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Message-ID: <20230712182534.GF41919@unreal>
Date: Wed, 12 Jul 2023 21:25:34 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Jedrzej Jagielski <jedrzej.jagielski@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, Michal Schmidt <mschmidt@...hat.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>
Subject: Re: [PATCH iwl-net v5] ice: Fix memory management in
 ice_ethtool_fdir.c

On Wed, Jul 12, 2023 at 03:02:10PM +0200, Jedrzej Jagielski wrote:
> 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(-)
> 

Thanks,
Reviewed-by: Leon Romanovsky <leonro@...dia.com>