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

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Message-ID: <Zff1Liloe7DwW7Fh@nanopsycho>
Date: Mon, 18 Mar 2024 09:02:54 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Dan Carpenter <dan.carpenter@...aro.org>
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()

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().




> 	int err;
> 	int i;
> 
>-- 
>2.43.0
>
>