linux-kernel - Re: [PATCH] ieee802154: hwsim: Fix possible memory leaks

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Message-ID: <20230407100148.16a0531e@xps-13>
Date:   Fri, 7 Apr 2023 10:01:48 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Chen Aotian <chenaotian2@....com>
Cc:     alex.aring@...il.com, stefan@...enfreihafen.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ieee802154: hwsim: Fix possible memory leaks

Hi Chen,

chenaotian2@....com wrote on Fri,  7 Apr 2023 09:26:26 +0800:

> After replacing e->info, it is necessary to free the old einfo.
> 
> Signed-off-by: Chen Aotian <chenaotian2@....com>
> ---
>  drivers/net/ieee802154/mac802154_hwsim.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
> index 8445c2189..6e7e10b17 100644
> --- a/drivers/net/ieee802154/mac802154_hwsim.c
> +++ b/drivers/net/ieee802154/mac802154_hwsim.c
> @@ -685,7 +685,7 @@ static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info)
>  static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
>  {
>  	struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
> -	struct hwsim_edge_info *einfo;
> +	struct hwsim_edge_info *einfo, *einfo_old;
>  	struct hwsim_phy *phy_v0;
>  	struct hwsim_edge *e;
>  	u32 v0, v1;
> @@ -723,8 +723,10 @@ static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
>  	list_for_each_entry_rcu(e, &phy_v0->edges, list) {
>  		if (e->endpoint->idx == v1) {
>  			einfo->lqi = lqi;
> +			einfo_old = rcu_dereference(e->info);
>  			rcu_assign_pointer(e->info, einfo);
>  			rcu_read_unlock();
> +			kfree_rcu(einfo_old, rcu);
>  			mutex_unlock(&hwsim_phys_lock);
>  			return 0;
>  		}

I'm not an RCU expert but the fix LGTM.

Reviewed-by: Miquel Raynal <miquel.raynal@...tlin.com>

What about adding:

Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb")
Cc: stable@...r.kernelorg

Thanks,
Miquèl