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

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Date: Sat, 16 Mar 2024 10:29:27 -0600
From: David Ahern <dsahern@...nel.org>
To: Dan Carpenter <dan.carpenter@...aro.org>, Ido Schimmel <idosch@...dia.com>
Cc: "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 3/16/24 3:46 AM, Dan Carpenter 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;
>  	int err;
>  	int i;
>  

Reviewed-by: David Ahern <dsahern@...nel.org>

The flag could be moved under
	`if (op_flags & NHA_OP_FLAG_DUMP_HW_STATS ...`
as well.