linux-kernel - Re: [PATCH net] nexthop: fix uninitialized variable in nla_put_nh_group

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Message-ID: <1e3c6bcb-a0af-4800-92e2-1cab10545572@moroto.mountain>
Date: Mon, 18 Mar 2024 11:11:31 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Jiri Pirko <jiri@...nulli.us>
Cc: Ido Schimmel <idosch@...dia.com>, David Ahern <dsahern@...nel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Petr Machata <petrm@...dia.com>, Kees Cook <keescook@...omium.org>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH net] nexthop: fix uninitialized variable in
 nla_put_nh_group_stats()

On Mon, Mar 18, 2024 at 09:02:54AM +0100, Jiri Pirko wrote:
> Sat, Mar 16, 2024 at 10:46:03AM CET, dan.carpenter@...aro.org wrote:
> >The nh_grp_hw_stats_update() function doesn't always set "hw_stats_used"
> >so it could be used without being initialized.  Set it to false.
> >
> >Fixes: 5072ae00aea4 ("net: nexthop: Expose nexthop group HW stats to user space")
> >Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
> >---
> > net/ipv4/nexthop.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> >diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c
> >index 74928a9d1aa4..c25bfdf4e25f 100644
> >--- a/net/ipv4/nexthop.c
> >+++ b/net/ipv4/nexthop.c
> >@@ -824,8 +824,8 @@ static int nla_put_nh_group_stats(struct sk_buff *skb, struct nexthop *nh,
> > 				  u32 op_flags)
> > {
> > 	struct nh_group *nhg = rtnl_dereference(nh->nh_grp);
> >+	bool hw_stats_used = false;
> > 	struct nlattr *nest;
> >-	bool hw_stats_used;
> 
> 
> Probably better to set this in one place and have:
>        if (nexthop_notifiers_is_empty(net)) {
> 	       *hw_stats_used = false;
>                return 0;
>        }
> in nh_grp_hw_stats_update().
> 

Sure.  Will do.

regards,
dan carpenter