linux-kernel - Re: [PATCH] flow_offload: action should not be NULL when it is referenced

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Date:   Wed, 18 Aug 2021 16:39:36 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     Jamal Hadi Salim <jhs@...atatu.com>
Cc:     13145886936@....com, davem@...emloft.net, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        gushengxian <gushengxian@...ong.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
Subject: Re: [PATCH] flow_offload: action should not be NULL when it is
 referenced

On Wed, Aug 18, 2021 at 08:36:55AM -0400, Jamal Hadi Salim wrote:
> On 2021-08-18 7:58 a.m., Ido Schimmel wrote:
> > On Sat, Jun 26, 2021 at 04:56:06AM -0700, 13145886936@....com wrote:
> > > From: gushengxian <gushengxian@...ong.com>
> > > 
> > > "action" should not be NULL when it is referenced.
> > > 
> > > Signed-off-by: gushengxian <13145886936@....com>
> > > Signed-off-by: gushengxian <gushengxian@...ong.com>
> > > ---
> > >   include/net/flow_offload.h | 12 +++++++-----
> > >   1 file changed, 7 insertions(+), 5 deletions(-)
> > > 
> > > diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h
> > > index dc5c1e69cd9f..69c9eabf8325 100644
> > > --- a/include/net/flow_offload.h
> > > +++ b/include/net/flow_offload.h
> > > @@ -319,12 +319,14 @@ flow_action_mixed_hw_stats_check(const struct flow_action *action,
> > >   	if (flow_offload_has_one_action(action))
> > >   		return true;
> > > -	flow_action_for_each(i, action_entry, action) {
> > > -		if (i && action_entry->hw_stats != last_hw_stats) {
> > > -			NL_SET_ERR_MSG_MOD(extack, "Mixing HW stats types for actions is not supported");
> > > -			return false;
> > > +	if (action) {
> > 
> > This patch generates a smatch warning:
> > 
> > include/net/flow_offload.h:322 flow_action_mixed_hw_stats_check() warn: variable dereferenced before check 'action' (see line 319)
> > 
> > Why the patch is needed? 'action' is already dereferenced in
> > flow_offload_has_one_action()
> > 
> 
> Yep, doesnt make sense at all.

Will send a revert