netdev - Re: [patch net-next v2] ethtool: cabletest: fix wrong conditional check

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Message-ID: <20240827193325.68bc341a@kernel.org>
Date: Tue, 27 Aug 2024 19:33:25 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Diogo Jahchan Koike <djahchankoike@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Maxime Chevallier
 <maxime.chevallier@...tlin.com>, Christophe Leroy
 <christophe.leroy@...roup.eu>,
 syzbot+5cf270e2069645b6bd2c@...kaller.appspotmail.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch net-next v2] ethtool: cabletest: fix wrong conditional
 check

On Tue, 27 Aug 2024 23:09:19 -0300 Diogo Jahchan Koike wrote:
> In ethnl_act_cable_test_tdr, phydev is tested for the condition of being
> null or an error by checking IS_ERR_OR_NULL, however the result is being
> negated and lets a null phydev go through. Simply removing the logical
> NOT on the conditional suffices.
> 
> Reported-by: syzbot+5cf270e2069645b6bd2c@...kaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=5cf270e2069645b6bd2c
> Fixes: 3688ff3077d3 ("net: ethtool: cable-test: Target the command to the requested PHY")
> Signed-off-by: Diogo Jahchan Koike <djahchankoike@...il.com>
> ---
> The previous patch was sent without the appropriate tags, apologize for
> that.

You were already told by Eric not to repost within 24h.

https://lore.kernel.org/all/CANn89iJ0qNYP8zMz6jDtP2=n23emnue4m2tyJkE64QL_xiwc9Q@mail.gmail.com/

There's already a fix from Maxime pending for this:
https://lore.kernel.org/all/20240827092314.2500284-1-maxime.chevallier@bootlin.com/

I didn't need to see the tags to tell you this.

> diff --git a/net/ethtool/cabletest.c b/net/ethtool/cabletest.c
> index d365ad5f5434..f25da884b3dd 100644
> --- a/net/ethtool/cabletest.c
> +++ b/net/ethtool/cabletest.c
> @@ -346,7 +346,7 @@ int ethnl_act_cable_test_tdr(struct sk_buff *skb, struct genl_info *info)
>  	phydev = ethnl_req_get_phydev(&req_info,
>  				      tb[ETHTOOL_A_CABLE_TEST_TDR_HEADER],
>  				      info->extack);
> -	if (!IS_ERR_OR_NULL(phydev)) {
> +	if (IS_ERR_OR_NULL(phydev)) {
>  		ret = -EOPNOTSUPP;
>  		goto out_dev_put;
>  	}

-- 
pw-bot: nap
pv-bot: 24h