linux-kernel - Re: [PATCH] net/mac80211/agg-rx.c: fix use of uninitialised values

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Message-ID: <1453984512.2217.15.camel@sipsolutions.net>
Date:	Thu, 28 Jan 2016 13:35:12 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Julian Calaby <julian.calaby@...il.com>
Cc:	Chris Bainbridge <chris.bainbridge@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	aryabinin@...tuozzo.com, Julia Lawall <Julia.Lawall@...6.fr>,
	kernel-janitors@...r.kernel.org, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] net/mac80211/agg-rx.c: fix use of uninitialised values

On Thu, 2016-01-28 at 15:30 +0300, Dan Carpenter wrote:
> It's not the return where we should trigger the warning it's at the
> 
> 	rcu_assign_pointer(sta->ampdu_mlme.tid_rx[tid], tid_agg_rx);
> 
> line.  That's for correctness, but also it should be slightly easier.
> Or it should cut down on false positives if we ignored returns and
> only looked global scope type assignements.

That's a good idea! But even that will probably get you a lot of false
positives. For example, in this structure, the rcu_head is never
initialized until we need it for kfree_rcu() or call_rcu(). I'm sure
there are other places like it.

johannes