linux-kernel - Re: [PATCH 4.19 10/72] ieee802154: hwsim: propagate genlmsg

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Message-ID: <20190503083359.GC5834@amd>
Date:   Fri, 3 May 2019 10:33:59 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Li RongQing <lirongqing@...du.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        "Sasha Levin (Microsoft)" <sashal@...nel.org>
Subject: Re: [PATCH 4.19 10/72] ieee802154: hwsim: propagate genlmsg_reply
 return code

On Thu 2019-05-02 17:20:32, Greg Kroah-Hartman wrote:
> [ Upstream commit 19b39a25388e71390e059906c979f87be4ef0c71 ]
> 
> genlmsg_reply can fail, so propagate its return code

> diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
> index 624bff4d3636..f1ed1744801c 100644
> --- a/drivers/net/ieee802154/mac802154_hwsim.c
> +++ b/drivers/net/ieee802154/mac802154_hwsim.c
> @@ -332,7 +332,7 @@ static int hwsim_get_radio_nl(struct sk_buff *msg, struct genl_info *info)
>  			goto out_err;
>  		}
>  
> -		genlmsg_reply(skb, info);
> +		res = genlmsg_reply(skb, info);
>  		break;
>  	}

How does the bug manifest for the user and is it severe enough?

Should this free the skb when it is signalling an error?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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